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2025-04-28 00:58:08
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A378701 | Number of minimal edge covers in the n-Plummer-Toft graph. | [
"25",
"66",
"181",
"456",
"1075",
"2579",
"6082",
"14414",
"34450",
"82895",
"201315",
"492855",
"1215426",
"3016505",
"7526261",
"18860558",
"47431375",
"119619948",
"302351431",
"765563707",
"1941079274",
"4926790178",
"12515217136",
"31811484793",
"80897818405",
"205801073727",
"523695045908",
"1332908173773"
] | [
"nonn",
"easy"
] | 16 | 1 | 1 | null | null | Eric W. Weisstein, Dec 04 2024 | 2024-12-09T10:59:01 | oeisdata/seq/A378/A378701.seq | b299de24aa1a0bbd2d9f43faf7431d9e |
A378702 | Primes p such that 256*p^8 + 1 is prime. | [
"2",
"59",
"271",
"281",
"433",
"467",
"587",
"971",
"1039",
"1097",
"1181",
"1277",
"1283",
"1361",
"1373",
"1427",
"1447",
"1481",
"1579",
"1657",
"1777",
"2089",
"2129",
"2269",
"2381",
"2617",
"2753",
"2803",
"2939",
"3181",
"3319",
"3691",
"3823",
"4093",
"4217",
"4241",
"4327",
"4909",
"4999",
"5279",
"5303",
"5387",
"5483",
"6043",
"6121",
"6197",
"6221",
"6563",
"6577",
"7159",
"7243",
"7867"
] | [
"nonn"
] | 10 | 1 | 1 | [
"A005384",
"A006314",
"A052291",
"A378134",
"A378143",
"A378146",
"A378702"
] | null | Juri-Stepan Gerasimov, Dec 04 2024 | 2024-12-21T00:29:49 | oeisdata/seq/A378/A378702.seq | 2f4651ba3d8b7dff6c1faf5f0ee799fc |
A378703 | Primes p such that 2^(nextprime(p) - p) + p is prime. | [
"3",
"7",
"13",
"37",
"43",
"67",
"73",
"97",
"139",
"163",
"223",
"277",
"283",
"337",
"367",
"409",
"463",
"487",
"547",
"577",
"643",
"709",
"733",
"757",
"787",
"823",
"937",
"967",
"1033",
"1039",
"1069",
"1087",
"1093",
"1117",
"1123",
"1201",
"1213",
"1237",
"1249",
"1303",
"1327",
"1399",
"1423",
"1483",
"1543",
"1567",
"1597",
"1657",
"1693",
"1747",
"1873",
"1879"
] | [
"nonn"
] | 10 | 1 | 1 | [
"A000040",
"A218075",
"A378703"
] | null | Juri-Stepan Gerasimov, Dec 04 2024 | 2024-12-21T00:30:05 | oeisdata/seq/A378/A378703.seq | e6534dd4f7388f5696260fa71155a225 |
A378704 | Array read by ascending antidiagonals: A(n, k) is the total area of n-Fibonacci polyominoes with k columns, where k > 0. | [
"2",
"3",
"7",
"4",
"11",
"16",
"5",
"15",
"31",
"35",
"6",
"19",
"43",
"73",
"70",
"7",
"23",
"55",
"111",
"168",
"136",
"8",
"27",
"67",
"143",
"261",
"370",
"256",
"9",
"31",
"79",
"175",
"351",
"602",
"790",
"473",
"10",
"35",
"91",
"207",
"431",
"816",
"1350",
"1658",
"860",
"11",
"39",
"103",
"239",
"511",
"1023",
"1865",
"2966",
"3425",
"1545",
"12",
"43",
"115",
"271",
"591",
"1215",
"2346",
"4178",
"6414",
"6989",
"2748"
] | [
"nonn",
"tabl"
] | 13 | 2 | 1 | [
"A004767",
"A017605",
"A356888",
"A378704",
"A378706",
"A378707",
"A378716"
] | null | Stefano Spezia, Dec 04 2024 | 2024-12-06T11:30:32 | oeisdata/seq/A378/A378704.seq | cb09772f69aebd87ea9891953afadd86 |
A378705 | Inverse permutation to A378200. | [
"1",
"3",
"5",
"6",
"2",
"4",
"10",
"12",
"8",
"14",
"15",
"7",
"13",
"9",
"11",
"21",
"23",
"19",
"25",
"17",
"27",
"28",
"16",
"26",
"18",
"24",
"20",
"22",
"36",
"38",
"34",
"40",
"32",
"42",
"30",
"44",
"45",
"29",
"43",
"31",
"41",
"33",
"39",
"35",
"37",
"55",
"57",
"53",
"59",
"51",
"61",
"49",
"63",
"47",
"65",
"66",
"46",
"64",
"48",
"62",
"50",
"60",
"52",
"58",
"54",
"56"
] | [
"nonn",
"tabf"
] | 21 | 1 | 2 | [
"A000027",
"A000384",
"A016813",
"A370655",
"A373498",
"A374447",
"A374494",
"A374531",
"A375602",
"A375725",
"A378200",
"A378684",
"A378705",
"A378762",
"A379342"
] | null | Boris Putievskiy, Dec 05 2024 | 2025-03-17T07:00:56 | oeisdata/seq/A378/A378705.seq | acdd9c032f4aa0700d1f4a8610b708ec |
A378706 | Array read by ascending antidiagonals: A(n,k) is the total semi-perimeter of n-Fibonacci polyominoes with k columns, where k > 0. | [
"3",
"4",
"8",
"5",
"10",
"16",
"6",
"12",
"25",
"33",
"7",
"14",
"29",
"54",
"63",
"8",
"16",
"33",
"69",
"118",
"119",
"9",
"18",
"37",
"77",
"152",
"251",
"219",
"10",
"20",
"41",
"85",
"177",
"335",
"521",
"398",
"11",
"22",
"45",
"93",
"193",
"390",
"727",
"1071",
"714",
"12",
"24",
"49",
"101",
"209",
"433",
"856",
"1557",
"2176",
"1269",
"13",
"26",
"53",
"109",
"225",
"465",
"948",
"1859",
"3297",
"4380",
"2237"
] | [
"nonn",
"tabl"
] | 11 | 2 | 1 | [
"A378704",
"A378706",
"A378707",
"A378716"
] | null | Stefano Spezia, Dec 05 2024 | 2024-12-06T11:30:41 | oeisdata/seq/A378/A378706.seq | 5b57f5624425f7e298aceaf46a185470 |
A378707 | Array read by ascending antidiagonals: A(n,k) is the total number of inner points of n-Fibonacci polyominoes with k columns, where k > 0. | [
"0",
"0",
"1",
"0",
"3",
"3",
"0",
"5",
"10",
"7",
"0",
"7",
"18",
"26",
"15",
"0",
"9",
"26",
"50",
"63",
"30",
"0",
"11",
"34",
"74",
"124",
"143",
"58",
"0",
"13",
"42",
"98",
"190",
"296",
"313",
"109",
"0",
"15",
"50",
"122",
"254",
"457",
"679",
"668",
"201",
"0",
"17",
"58",
"146",
"318",
"622",
"1070",
"1517",
"1398",
"365",
"0",
"19",
"66",
"170",
"382",
"782",
"1461",
"2439",
"3325",
"2883",
"655"
] | [
"nonn",
"tabl"
] | 13 | 2 | 5 | [
"A023610",
"A378704",
"A378706",
"A378707",
"A378716"
] | null | Stefano Spezia, Dec 05 2024 | 2024-12-06T11:11:36 | oeisdata/seq/A378/A378707.seq | cf90e420a03d85970d745af9000ae62b |
A378708 | Circumference of the n-Lucas cube graph. | [
"4",
"10",
"16",
"28",
"46",
"74",
"122",
"198",
"320"
] | [
"nonn",
"more"
] | 9 | 4 | 1 | null | null | Eric W. Weisstein, Dec 04 2024 | 2024-12-04T20:54:03 | oeisdata/seq/A378/A378708.seq | 2525df6c50d33ca3327377d94f28933e |
A378709 | Circumference of the n-Pell graph. | [
"4",
"12",
"28",
"70",
"168"
] | [
"nonn",
"more"
] | 7 | 2 | 1 | null | null | Eric W. Weisstein, Dec 04 2024 | 2024-12-04T17:51:00 | oeisdata/seq/A378/A378709.seq | 1357b1dbd5d139dbe067ca0127d60f95 |
A378710 | Positive numbers k such that -k is properly represented by the Pell Form x^2 - 15*y^2. | [
"6",
"11",
"14",
"15",
"35",
"51",
"59",
"71",
"86",
"110",
"119",
"131",
"134",
"159",
"179",
"191",
"206",
"215",
"231",
"239",
"251",
"254",
"294",
"311",
"326",
"335",
"339",
"359",
"366",
"371",
"374",
"411",
"419",
"431",
"446",
"479",
"491",
"519",
"515",
"519",
"539",
"566",
"590",
"591",
"599",
"614",
"635",
"654",
"659",
"671",
"686"
] | [
"nonn"
] | 11 | 1 | 1 | [
"A038887",
"A097956",
"A141302",
"A237606",
"A307359",
"A378710",
"A378711"
] | null | Wolfdieter Lang, Dec 13 2024 | 2025-01-17T02:27:12 | oeisdata/seq/A378/A378710.seq | 6601172694a85d8e7418325e2fc81388 |
A378711 | Irregular triangle read by rows: row n gives the proper positive integer fundamental solutions (x, y) of x^2 - 15*y^2 = - A378710(n), for n >= 1. | [
"3",
"1",
"2",
"1",
"7",
"2",
"1",
"1",
"11",
"3",
"15",
"4",
"5",
"2",
"10",
"3",
"3",
"2",
"18",
"5",
"1",
"2",
"26",
"7",
"8",
"3",
"13",
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"7",
"3",
"17",
"5",
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"24",
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"5",
"19",
"6",
"7",
"4",
"32",
"9",
"13",
"5",
"23",
"7",
"5",
"4",
"40",
"11",
"3",
"4",
"12",
"5",
"27",
"8",
"48",
"13",
"1",
"4",
"56",
"15"
] | [
"nonn",
"tabf"
] | 6 | 1 | 1 | [
"A001090",
"A038887",
"A097956",
"A141302",
"A378710",
"A378711"
] | null | Wolfdieter Lang, Dec 13 2024 | 2025-01-02T04:32:41 | oeisdata/seq/A378/A378711.seq | 5a96cf28189669d87ff6f8e6a673c0c9 |
A378712 | Decimal expansion of the surface area of a disdyakis dodecahedron with unit shorter edge length. | [
"3",
"2",
"0",
"6",
"6",
"7",
"3",
"4",
"0",
"1",
"0",
"5",
"3",
"1",
"9",
"4",
"4",
"4",
"1",
"3",
"3",
"4",
"9",
"8",
"2",
"3",
"8",
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"8",
"9",
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"2",
"3",
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"6",
"2",
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"4",
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"5",
"1",
"5",
"5",
"3",
"2",
"5",
"4",
"5",
"6",
"0",
"5",
"3",
"0",
"9",
"5",
"7",
"9",
"9",
"5",
"3",
"6",
"2",
"4",
"8",
"9",
"0",
"0",
"6",
"0",
"2",
"1",
"1",
"0",
"7",
"4",
"3",
"5",
"3",
"1",
"8",
"1",
"5",
"7",
"1"
] | [
"nonn",
"cons",
"easy"
] | 11 | 2 | 1 | [
"A002193",
"A377343",
"A378393",
"A378712",
"A378713",
"A378714",
"A378715"
] | null | Paolo Xausa, Dec 06 2024 | 2025-02-05T10:40:30 | oeisdata/seq/A378/A378712.seq | 2fd56d1d962b9d4d2175d63f7f8e23bf |
A378713 | Decimal expansion of the volume of a disdyakis dodecahedron with unit shorter edge length. | [
"1",
"6",
"2",
"8",
"8",
"9",
"1",
"9",
"0",
"8",
"2",
"9",
"2",
"3",
"5",
"2",
"5",
"0",
"3",
"8",
"5",
"0",
"3",
"1",
"2",
"2",
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"3",
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"1",
"9",
"4",
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"4",
"5",
"9",
"9",
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"9",
"7",
"4",
"4",
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"3",
"5",
"7",
"0",
"2",
"7",
"2",
"1",
"7",
"2",
"4",
"8",
"7",
"2",
"2",
"8",
"3",
"5",
"7",
"8",
"3",
"7",
"0",
"1",
"3",
"4",
"1",
"5",
"1",
"8",
"7",
"0",
"4",
"9",
"5",
"9",
"7",
"6",
"5",
"0",
"6",
"9",
"2"
] | [
"nonn",
"cons",
"easy"
] | 12 | 2 | 2 | [
"A002193",
"A377344",
"A378393",
"A378712",
"A378713",
"A378714",
"A378715"
] | null | Paolo Xausa, Dec 07 2024 | 2025-02-05T10:40:59 | oeisdata/seq/A378/A378713.seq | 09acb233c7c0d16c046e0453bb42431f |
A378714 | Decimal expansion of the inradius of a disdyakis dodecahedron with unit shorter edge length. | [
"1",
"5",
"2",
"3",
"9",
"0",
"8",
"1",
"4",
"8",
"3",
"2",
"3",
"4",
"5",
"7",
"5",
"4",
"9",
"6",
"9",
"3",
"5",
"8",
"1",
"3",
"2",
"9",
"4",
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"8",
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"5",
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"3",
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"2",
"5",
"7",
"8",
"6",
"6",
"3",
"5",
"2",
"9",
"8",
"1",
"6",
"1",
"8",
"3",
"0",
"8",
"3",
"5",
"9",
"2",
"3",
"5",
"6",
"8",
"5",
"3",
"2",
"5",
"3",
"0",
"7",
"7",
"4",
"8",
"6",
"3",
"5",
"6",
"8",
"2",
"3"
] | [
"nonn",
"cons",
"easy"
] | 11 | 1 | 2 | [
"A002193",
"A378393",
"A378712",
"A378713",
"A378714",
"A378715"
] | null | Paolo Xausa, Dec 07 2024 | 2025-02-05T10:59:25 | oeisdata/seq/A378/A378714.seq | 7993d89f828c88285a558e2e12383c39 |
A378715 | Decimal expansion of the dihedral angle, in radians, between any two adjacent faces in a disdyakis dodecahedron. | [
"2",
"7",
"0",
"6",
"6",
"9",
"4",
"6",
"4",
"5",
"4",
"7",
"9",
"2",
"2",
"8",
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"9",
"3",
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"9",
"9",
"0",
"5",
"8",
"4",
"7",
"8",
"6",
"4",
"1",
"0",
"1",
"8",
"3"
] | [
"nonn",
"cons",
"easy"
] | 8 | 1 | 1 | [
"A002193",
"A177870",
"A195698",
"A195702",
"A378393",
"A378712",
"A378713",
"A378714",
"A378715"
] | null | Paolo Xausa, Dec 07 2024 | 2024-12-08T02:48:13 | oeisdata/seq/A378/A378715.seq | 997a89e136132a8dd9ee84e31f043568 |
A378716 | Triangle read by rows: T(n,k) is the number of k-Fibonacci polyominoes with an area of n, with k > 1. | [
"1",
"1",
"1",
"1",
"0",
"1",
"2",
"1",
"0",
"1",
"2",
"2",
"0",
"0",
"1",
"3",
"0",
"1",
"0",
"0",
"1",
"4",
"2",
"1",
"0",
"0",
"0",
"1",
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"1",
"0",
"0",
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"7",
"1",
"1",
"1",
"0",
"0",
"0",
"0",
"1",
"9",
"5",
"2",
"0",
"1",
"0",
"0",
"0",
"0",
"1",
"12",
"5",
"1",
"1",
"1",
"0",
"0",
"0",
"0",
"0",
"1",
"16",
"3",
"2",
"0",
"0",
"1",
"0",
"0",
"0",
"0",
"0",
"1",
"21",
"10",
"3",
"3",
"0",
"1",
"0",
"0",
"0",
"0",
"0",
"0",
"1"
] | [
"nonn",
"tabl"
] | 10 | 3 | 7 | [
"A079957",
"A182097",
"A378704",
"A378706",
"A378707",
"A378716"
] | null | Stefano Spezia, Dec 05 2024 | 2024-12-06T11:30:50 | oeisdata/seq/A378/A378716.seq | ac8dbf71d157b84fe097782c2fc87497 |
A378717 | Products of 4 distinct primes numbers (or tetraprimes) that are deficient. | [
"1155",
"1365",
"1785",
"1995",
"2145",
"2415",
"2618",
"2805",
"2926",
"3003",
"3045",
"3094",
"3135",
"3255",
"3315",
"3458",
"3542",
"3705",
"3795",
"3885",
"3910",
"3927",
"4186",
"4305",
"4370",
"4389",
"4466",
"4485",
"4515",
"4522",
"4641",
"4774",
"4785",
"4810",
"4845",
"4862",
"4930",
"4935",
"5005",
"5115",
"5187",
"5270",
"5278",
"5313",
"5330",
"5434",
"5474",
"5510",
"5565",
"5590"
] | [
"nonn"
] | 11 | 1 | 1 | [
"A005100",
"A046386",
"A046390",
"A378480",
"A378717"
] | null | Massimo Kofler, Dec 05 2024 | 2024-12-06T16:31:40 | oeisdata/seq/A378/A378717.seq | 68530981d8ca0a95a8853bd66423368b |
A378718 | a(n) is the smallest integer k such that [1,2,...,k] contains a set of n but no more disjoint consecutive subsequences, each having element sum k. | [
"1",
"3",
"15",
"27",
"75",
"165",
"345",
"315",
"693",
"945",
"1365",
"2457",
"2835",
"4455",
"3465",
"4095",
"7245",
"15435",
"12285",
"10395",
"17325",
"27405",
"24255",
"29925",
"31185",
"48195",
"70875",
"45045",
"58905",
"61425",
"89775",
"128205",
"142065",
"121275",
"135135"
] | [
"nonn",
"more"
] | 23 | 1 | 2 | null | null | Michel Lagneau, Dec 05 2024 | 2024-12-20T13:09:10 | oeisdata/seq/A378/A378718.seq | 873788f7fd2badb90482b4a72875e727 |
A378719 | Numbers k for which k/w = 3/4, where w is the number of numbers in the range {1..k} containing at least one decimal digit 1. | [
"19131872",
"20809344",
"20811488",
"21257636",
"22732948",
"172186880",
"1549681952",
"2870345516",
"2870345520",
"2871907160",
"2872143356",
"2872251248",
"13947137600",
"125524238432",
"496384984980",
"516044091344",
"530010360824",
"530030555544",
"530031618464",
"530032461188",
"530163415832",
"530260860088"
] | [
"nonn",
"base",
"fini",
"full"
] | 19 | 1 | 1 | [
"A004835",
"A346685",
"A378719"
] | null | Karl-Heinz Hofmann and Hugo Pfoertner, Dec 05 2024 | 2025-03-12T05:43:06 | oeisdata/seq/A378/A378719.seq | 1f0469999b791ddfe38945a91db9b5e7 |
A378720 | a(n) is the numerator of the asymptotic density of numbers whose third smallest prime divisor is prime(n). | [
"0",
"0",
"1",
"1",
"4",
"326",
"628",
"992",
"98304",
"125568",
"733440",
"281163264",
"386427322368",
"3178249003008",
"12454223855616",
"6450728943845376",
"342348724735967232",
"20218431581110665216",
"39814891891080560640",
"82739188294287768944640",
"15336676441718784000",
"61298453882755419734016000"
] | [
"nonn",
"easy",
"frac",
"changed"
] | 18 | 1 | 5 | [
"A000040",
"A000977",
"A002110",
"A038110",
"A038111",
"A284411",
"A342479",
"A342480",
"A378720",
"A378721"
] | null | Robert G. Wilson v and Amiram Eldar, Dec 05 2024 | 2025-04-14T05:35:49 | oeisdata/seq/A378/A378720.seq | ea49ced221f2868cc0c1136d6d65f3f4 |
A378721 | a(n) is the denominator of the asymptotic density of numbers whose third smallest prime divisor is prime(n). | [
"1",
"1",
"30",
"30",
"165",
"15015",
"36465",
"62985",
"7436429",
"11849255",
"73465381",
"33426748355",
"50708377254535",
"436092044389001",
"1863302371480277",
"1086305282573001491",
"64092011671807087969",
"3909612711980232366109",
"8449808119441147371913",
"18598027670889965365580513",
"3543193335582015099413"
] | [
"nonn",
"easy",
"frac"
] | 11 | 1 | 3 | [
"A000040",
"A038110",
"A038111",
"A342479",
"A342480",
"A378720",
"A378721"
] | null | Robert G. Wilson v and Amiram Eldar, Dec 05 2024 | 2024-12-06T11:30:15 | oeisdata/seq/A378/A378721.seq | d34fe01c0e0eff565e4c2a1d4effc015 |
A378722 | a(1) = 1, a(2) = 2. For n > 2, a(n) is the smallest number not already a term which is divisible by A007947(a(n-1)/A020639(a(n-1))). | [
"1",
"2",
"3",
"4",
"6",
"9",
"12",
"18",
"15",
"5",
"7",
"8",
"10",
"20",
"30",
"45",
"60",
"90",
"75",
"25",
"35",
"14",
"21",
"28",
"42",
"63",
"84",
"126",
"105",
"70",
"140",
"210",
"315",
"420",
"630",
"525",
"175",
"245",
"49",
"56",
"98",
"77",
"11",
"13",
"16",
"22",
"33",
"44",
"66",
"99",
"132",
"198",
"165",
"55",
"88",
"110",
"220",
"330",
"495",
"660",
"990",
"825",
"275"
] | [
"nonn",
"easy"
] | 13 | 1 | 2 | [
"A007947",
"A020639",
"A378722"
] | null | David James Sycamore, Dec 05 2024 | 2024-12-07T08:02:31 | oeisdata/seq/A378/A378722.seq | fe0561cf697a86b0b8349c7e39ab9559 |
A378723 | Triangle read by rows: row n gives denominators of n distinct unit fractions (or Egyptian fractions) summing to 1, where denominators are listed in increasing order and the denominators from largest to smallest are as small as possible. | [
"1",
"0",
"0",
"2",
"3",
"6",
"2",
"4",
"6",
"12",
"2",
"4",
"10",
"12",
"15",
"3",
"4",
"6",
"10",
"12",
"15",
"3",
"4",
"9",
"10",
"12",
"15",
"18",
"4",
"5",
"6",
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"10",
"15",
"18",
"20",
"4",
"6",
"8",
"9",
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"18",
"24",
"5",
"6",
"8",
"9",
"10",
"12",
"15",
"18",
"20",
"24",
"6",
"7",
"8",
"9",
"10",
"12",
"14",
"15",
"18",
"24",
"28",
"6",
"7",
"8",
"9",
"10",
"14",
"15",
"18",
"20",
"24",
"28",
"30"
] | [
"nonn",
"tabl"
] | 15 | 1 | 4 | [
"A073546",
"A216993",
"A378723"
] | null | Sean A. Irvine, Dec 05 2024 | 2024-12-07T04:27:34 | oeisdata/seq/A378/A378723.seq | 7634383a43a2164ea4c9386f0558a7be |
A378724 | The number of root fires on a rooted undirected infinite ternary tree with a self-loop at the root, when the chip-firing process starts with 3n chips at the root. | [
"0",
"1",
"2",
"3",
"5",
"6",
"7",
"9",
"10",
"11",
"13",
"14",
"15",
"18",
"19",
"20",
"22",
"23",
"24",
"26",
"27",
"28",
"31",
"32",
"33",
"35",
"36",
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"39",
"40",
"41",
"44",
"45",
"46",
"48",
"49",
"50",
"52",
"53",
"54",
"58",
"59",
"60",
"62",
"63",
"64",
"66",
"67",
"68",
"71",
"72",
"73",
"75",
"76",
"77",
"79",
"80",
"81",
"84",
"85",
"86",
"88",
"89",
"90",
"92",
"93",
"94",
"98",
"99",
"100",
"102",
"103",
"104",
"106",
"107"
] | [
"nonn"
] | 23 | 1 | 3 | [
"A376116",
"A378724",
"A378725",
"A378726",
"A378727",
"A378728"
] | null | Tanya Khovanova and the MIT PRIMES STEP senior group, Dec 05 2024 | 2025-04-04T06:29:02 | oeisdata/seq/A378/A378724.seq | 4edfbbf57350dc61ebd10231ba755421 |
A378725 | a(n) = A378724(n+1) - A378724(n). | [
"1",
"1",
"1",
"2",
"1",
"1",
"2",
"1",
"1",
"2",
"1",
"1",
"3",
"1",
"1",
"2",
"1",
"1",
"2",
"1",
"1",
"3",
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"1",
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"1",
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"1",
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"1",
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"1",
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"1",
"4",
"1",
"1",
"2",
"1",
"1",
"2",
"1",
"1",
"3",
"1",
"1",
"2",
"1",
"1",
"2",
"1",
"1",
"3",
"1",
"1",
"2",
"1",
"1",
"2",
"1",
"1",
"4",
"1",
"1",
"2",
"1",
"1",
"2",
"1",
"1",
"3"
] | [
"nonn"
] | 13 | 1 | 4 | [
"A091090",
"A378724",
"A378725",
"A378726",
"A378727",
"A378728"
] | null | Tanya Khovanova and the MIT PRIMES STEP senior group, Dec 05 2024 | 2025-01-24T12:14:34 | oeisdata/seq/A378/A378725.seq | a5689ab8721a6f19b6a8baccf48b230f |
A378726 | The total number of fires on a rooted undirected infinite ternary tree with a self-loop at the root, when the chip-firing process starts with 3n chips at the root. | [
"0",
"1",
"2",
"3",
"8",
"9",
"10",
"15",
"16",
"17",
"22",
"23",
"24",
"42",
"43",
"44",
"49",
"50",
"51",
"56",
"57",
"58",
"76",
"77",
"78",
"83",
"84",
"85",
"90",
"91",
"92",
"110",
"111",
"112",
"117",
"118",
"119",
"124",
"125",
"126",
"184",
"185",
"186",
"191",
"192",
"193",
"198",
"199",
"200",
"218",
"219",
"220",
"225",
"226",
"227",
"232",
"233",
"234",
"252",
"253",
"254",
"259",
"260",
"261",
"266",
"267",
"268",
"326"
] | [
"nonn"
] | 19 | 1 | 3 | [
"A376131",
"A378724",
"A378725",
"A378726",
"A378727",
"A378728"
] | null | Tanya Khovanova and the MIT PRIMES STEP senior group, Dec 05 2024 | 2025-04-06T08:46:26 | oeisdata/seq/A378/A378726.seq | ff6edafb2f8e6083d41be720d781ffad |
A378727 | The total number of fires in a rooted undirected infinite 4-ary tree with a self-loop at the root, when the chip-firing process starts with (4^n-1)/3 chips at the root. | [
"0",
"1",
"10",
"67",
"380",
"1973",
"9710",
"46119",
"213600",
"970905",
"4349650",
"19262731",
"84507460",
"367855997",
"1590728630",
"6840133103",
"29269406760",
"124713124449",
"529394487450",
"2239745908435",
"9447655468300",
"39745309211461",
"166799986198910",
"698474942207927",
"2918999758480880",
"12176398992520233",
"50707195804467810"
] | [
"nonn",
"easy"
] | 18 | 1 | 3 | [
"A014916",
"A045618",
"A212337",
"A378727",
"A378728"
] | null | Tanya Khovanova and the MIT PRIMES STEP senior group, Dec 05 2024 | 2025-04-02T20:14:05 | oeisdata/seq/A378/A378727.seq | 73a4c750b9777cb2ce849e39d1e34da0 |
A378728 | The total number of fires in a rooted undirected infinite 5-ary tree with a self-loop at the root, when the chip-firing process starts with (5^n-1)/4 chips at the root. | [
"0",
"1",
"12",
"98",
"684",
"4395",
"26856",
"158692",
"915528",
"5187989",
"28991700",
"160217286",
"877380372",
"4768371583",
"25749206544",
"138282775880",
"739097595216",
"3933906555177",
"20861625671388",
"110268592834474",
"581145286560060",
"3054738044738771",
"16018748283386232",
"83819031715393068"
] | [
"nonn",
"easy"
] | 34 | 1 | 3 | [
"A014917",
"A045618",
"A212337",
"A378727",
"A378728"
] | null | Tanya Khovanova and the MIT PRIMES STEP senior group, Dec 05 2024 | 2025-04-04T23:42:57 | oeisdata/seq/A378/A378728.seq | 3c0af6090c4a9dea42982dfe95bcfafe |
A378729 | Characteristic function of the primitive practical numbers as a subsequence of the practical numbers. | [
"1",
"1",
"0",
"1",
"0",
"0",
"0",
"0",
"1",
"0",
"1",
"1",
"0",
"0",
"0",
"1",
"0",
"0",
"0",
"0",
"0",
"1",
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"1",
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"0",
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"0",
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"0",
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"1",
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"1",
"1",
"1",
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"0",
"0",
"1",
"0",
"1",
"1",
"1",
"0",
"0",
"1",
"1",
"0",
"1",
"0",
"1",
"0",
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"1",
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"0",
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"0",
"0",
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"1",
"1",
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"1",
"0",
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"1",
"0",
"0",
"1",
"0",
"0",
"1",
"0",
"1",
"0",
"0",
"1"
] | [
"nonn"
] | 19 | 1 | 0 | [
"A005153",
"A267124",
"A378729"
] | null | Frank M Jackson, Dec 06 2024 | 2024-12-08T17:20:48 | oeisdata/seq/A378/A378729.seq | 4a8c0c13c213c6781e04b53888844f2c |
A378730 | G.f. A(x) satisfies A(x) = ( 1 + x / (1 - x*A(x)^(3/2)) )^2. | [
"1",
"2",
"3",
"10",
"35",
"134",
"544",
"2288",
"9907",
"43830",
"197300",
"900738",
"4160521",
"19408084",
"91302317",
"432663728",
"2063421045",
"9896113574",
"47698770359",
"230932635206",
"1122545149941",
"5476405604806",
"26805046064328",
"131595640014314",
"647829955225386",
"3197267300375652"
] | [
"nonn"
] | 10 | 0 | 2 | [
"A364742",
"A365119",
"A378730"
] | null | Seiichi Manyama, Dec 05 2024 | 2024-12-06T11:10:27 | oeisdata/seq/A378/A378730.seq | a9b7009eb39485249c4e18a4d868ff14 |
A378731 | G.f. A(x) satisfies A(x) = ( 1 + x / (1 - x*A(x)^(4/3)) )^3. | [
"1",
"3",
"6",
"22",
"93",
"417",
"1993",
"9864",
"50217",
"261239",
"1382448",
"7418877",
"40278175",
"220830513",
"1220930337",
"6799458685",
"38107621704",
"214771481163",
"1216457185122",
"6920603372448",
"39529745832681",
"226605757331904",
"1303291125124071",
"7518151040142000",
"43488151271999326"
] | [
"nonn"
] | 12 | 0 | 2 | [
"A364743",
"A371612",
"A378731",
"A378732"
] | null | Seiichi Manyama, Dec 05 2024 | 2024-12-06T11:10:31 | oeisdata/seq/A378/A378731.seq | f599f7d6402f09524c8b424c85f85115 |
A378732 | G.f. A(x) satisfies A(x) = ( 1 + x / (1 - x*A(x)) )^4. | [
"1",
"4",
"10",
"36",
"155",
"704",
"3384",
"16844",
"86097",
"449344",
"2384170",
"12822556",
"69743953",
"382982940",
"2120323014",
"11822279232",
"66327376437",
"374162700460",
"2120999728610",
"12075668658000",
"69021358842795",
"395909382981572",
"2278286453089574",
"13149207655326372",
"76096242994616990"
] | [
"nonn"
] | 11 | 0 | 2 | [
"A364743",
"A365118",
"A365119",
"A371612",
"A378731",
"A378732"
] | null | Seiichi Manyama, Dec 05 2024 | 2024-12-06T11:10:35 | oeisdata/seq/A378/A378732.seq | 6d46235cb38c54562dbbd9577d324b32 |
A378733 | G.f. A(x) satisfies A(x) = 1 + x / (1 - x*A(x)^2)^4. | [
"1",
"1",
"4",
"18",
"96",
"551",
"3332",
"20906",
"134820",
"888151",
"5951096",
"40432550",
"277892604",
"1928668910",
"13497833600",
"95150192558",
"674993798716",
"4815149310441",
"34519885929860",
"248571425473698",
"1797058507267104",
"13038781500215352",
"94914559729835580",
"692987915940266152"
] | [
"nonn"
] | 11 | 0 | 3 | [
"A001764",
"A161634",
"A365123",
"A367236",
"A378733"
] | null | Seiichi Manyama, Dec 06 2024 | 2024-12-15T09:08:15 | oeisdata/seq/A378/A378733.seq | 27ce7a3c27cd395673e7d4f13eeb18da |
A378734 | Number of multisets E(n) generable by the following procedure: E(0) = { 0, 0, ... }; to get an E(n+1) from an E(n), first increment all elements then optionally choose an x and a y and replace them with 0 and x+y. | [
"1",
"2",
"6",
"23",
"108",
"579",
"3447",
"22190",
"152407",
"1103566",
"8355894",
"65701413"
] | [
"nonn",
"more"
] | 14 | 0 | 2 | null | null | Luc Rousseau, Dec 06 2024 | 2024-12-12T09:30:11 | oeisdata/seq/A378/A378734.seq | bbf108ae00122bfbb7b5d41707caa28e |
A378735 | Greatest non-abundant divisor of the n-th abundant number. | [
"6",
"9",
"10",
"8",
"15",
"9",
"10",
"21",
"16",
"27",
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"99",
"50",
"68",
"52",
"105",
"27",
"110",
"111",
"32",
"76",
"117",
"16",
"123",
"63",
"129",
"130",
"44",
"135",
"136",
"92",
"35",
"141",
"32",
"147",
"75",
"152",
"153",
"154",
"52",
"159",
"64",
"81",
"165"
] | [
"nonn"
] | 9 | 1 | 1 | [
"A005101",
"A294935",
"A378665",
"A378735",
"A378736",
"A378737"
] | null | Antti Karttunen, Dec 06 2024 | 2024-12-06T20:44:25 | oeisdata/seq/A378/A378735.seq | 91fc5c06b755119ec2555b070a2fd007 |
A378736 | Greatest divisor d of the n-th abundant number such that sigma(d) <= 2*d < A003961(d). | [
"6",
"9",
"10",
"8",
"15",
"9",
"10",
"21",
"16",
"27",
"28",
"15",
"6",
"35",
"9",
"39",
"16",
"28",
"44",
"45",
"32",
"50",
"6",
"52",
"27",
"28",
"57",
"15",
"63",
"44",
"69",
"35",
"16",
"75",
"52",
"32",
"81",
"28",
"6",
"44",
"45",
"6",
"64",
"98",
"99",
"50",
"68",
"52",
"105",
"27",
"110",
"6",
"32",
"76",
"117",
"16",
"6",
"63",
"6",
"130",
"44",
"135",
"136",
"92",
"35",
"6",
"32",
"147",
"75",
"152",
"153",
"154",
"52",
"6",
"64",
"81",
"165",
"28",
"170",
"171"
] | [
"nonn"
] | 18 | 1 | 1 | [
"A003961",
"A005101",
"A294935",
"A337372",
"A341612",
"A378664",
"A378735",
"A378736",
"A378737"
] | null | Antti Karttunen, Dec 06 2024 | 2024-12-12T15:14:49 | oeisdata/seq/A378/A378736.seq | e019529122807af92d36bba7c30f5285 |
A378737 | Abundant numbers k for which A378665(k) > A378664(k). | [
"66",
"102",
"174",
"186",
"222",
"246",
"258",
"282",
"318",
"354",
"366",
"402",
"426",
"438",
"474",
"498",
"534",
"582",
"606",
"618",
"642",
"654",
"678",
"748",
"762",
"786",
"822",
"834",
"894",
"906",
"942",
"978",
"1002",
"1038",
"1074",
"1086",
"1146",
"1158",
"1182",
"1194",
"1266",
"1338",
"1362",
"1374",
"1398",
"1434",
"1446",
"1496",
"1506",
"1542",
"1578",
"1614",
"1626",
"1662",
"1686",
"1698",
"1758",
"1842"
] | [
"nonn"
] | 14 | 1 | 1 | [
"A005101",
"A337372",
"A378664",
"A378665",
"A378735",
"A378736",
"A378737",
"A378738",
"A378740"
] | null | Antti Karttunen, Dec 06 2024 | 2024-12-08T17:24:36 | oeisdata/seq/A378/A378737.seq | f1d6a16411f230a5152e4a4bf3d73bfc |
A378738 | Primitively abundant numbers k for which A378665(k) > A378664(k). | [
"66",
"102",
"174",
"186",
"222",
"246",
"258",
"282",
"318",
"354",
"366",
"402",
"426",
"438",
"474",
"498",
"534",
"582",
"606",
"618",
"642",
"654",
"678",
"748",
"762",
"786",
"822",
"834",
"894",
"906",
"942",
"978",
"1002",
"1038",
"1074",
"1086",
"1146",
"1158",
"1182",
"1194",
"1266",
"1338",
"1362",
"1374",
"1398",
"1434",
"1446",
"1506",
"1542",
"1578",
"1614",
"1626",
"1662",
"1686",
"1698",
"1758",
"1842",
"1866"
] | [
"nonn"
] | 30 | 1 | 1 | [
"A001222",
"A032742",
"A091191",
"A294930",
"A337372",
"A341612",
"A341614",
"A378664",
"A378665",
"A378735",
"A378736",
"A378737",
"A378738",
"A378739",
"A378741",
"A378742"
] | null | Antti Karttunen, Dec 07 2024 | 2025-01-29T07:55:34 | oeisdata/seq/A378/A378738.seq | 6403f239988e2128d6154cf8541197cc |
A378739 | A378664(k) computed for those primitively abundant numbers k for which A378664(k) is less than the largest proper divisor of k. | [
"6",
"6",
"6",
"6",
"6",
"6",
"6",
"6",
"6",
"6",
"6",
"6",
"6",
"6",
"6",
"6",
"6",
"6",
"6",
"6",
"6",
"6",
"6",
"68",
"6",
"6",
"6",
"6",
"6",
"6",
"6",
"6",
"6",
"6",
"6",
"6",
"6",
"6",
"6",
"6",
"6",
"6",
"6",
"6",
"6",
"6",
"6",
"6",
"6",
"6",
"6",
"6",
"6",
"6",
"6",
"6",
"6",
"6",
"170",
"6",
"6",
"6",
"6",
"6",
"6",
"6",
"6",
"6",
"6",
"6",
"6",
"6",
"6",
"6",
"6",
"6",
"6",
"6",
"6",
"6",
"6",
"6",
"6",
"6",
"6",
"6",
"6",
"6",
"6",
"6",
"6",
"6",
"6",
"6",
"290",
"646",
"6",
"6",
"6",
"6",
"682",
"6"
] | [
"nonn"
] | 9 | 1 | 1 | [
"A091191",
"A378664",
"A378738",
"A378739",
"A378740",
"A378741"
] | null | Antti Karttunen, Dec 07 2024 | 2024-12-07T19:31:00 | oeisdata/seq/A378/A378739.seq | 6a9cc49b3408e174a5db7dd510a7e112 |
A378740 | Distinct values of A378664(k) in the order of appearance, when k ranges over those primitively abundant numbers k for which A378664(k) is less than the largest proper divisor of k. | [
"6",
"68",
"170",
"290",
"646",
"682",
"754",
"370",
"410",
"430",
"470",
"530",
"4756",
"6844",
"8236",
"30566",
"10730",
"11890",
"12470",
"43214",
"45182",
"46342",
"47386",
"15170",
"15370",
"54094",
"17110",
"17690",
"62186",
"62894",
"19430",
"75686",
"79178",
"39530",
"89914",
"41890",
"43070",
"95282",
"97966",
"46610",
"103402",
"47570",
"106018",
"107602",
"107666",
"48970",
"109798",
"111386",
"51830"
] | [
"nonn"
] | 16 | 1 | 1 | [
"A091191",
"A246282",
"A337372",
"A378658",
"A378662",
"A378664",
"A378736",
"A378738",
"A378739",
"A378740",
"A378741"
] | null | Antti Karttunen, Dec 07 2024 | 2024-12-12T15:15:01 | oeisdata/seq/A378/A378740.seq | d10e5313936fdd8eb627ee873a01a19b |
A378741 | Terms k of A378738 for which A378664(k) obtains novel values. | [
"66",
"748",
"1870",
"3190",
"3230",
"3410",
"3770",
"4070",
"4510",
"4730",
"5170",
"5830",
"52316",
"75284",
"90596",
"152830",
"182410",
"202130",
"211990",
"216070",
"225910",
"231710",
"236930",
"257890",
"261290",
"270470",
"290870",
"300730",
"310930",
"314470",
"330310",
"378430",
"395890",
"434830",
"449570",
"460790",
"473770",
"476410",
"489830",
"512710",
"517010",
"523270",
"530090"
] | [
"nonn"
] | 11 | 1 | 1 | [
"A091191",
"A378664",
"A378738",
"A378740",
"A378741"
] | null | Antti Karttunen, Dec 07 2024 | 2024-12-07T19:30:15 | oeisdata/seq/A378/A378741.seq | 0bce8c95bf15f40daff298b15008b70b |
A378742 | Primitively abundant numbers k for which A378664(k) = 6, where A378664 is the greatest divisor d of n such that sigma(d) <= 2*d < A003961(d), or 1 if no such divisor exists | [
"12",
"66",
"102",
"174",
"186",
"222",
"246",
"258",
"282",
"318",
"354",
"366",
"402",
"426",
"438",
"474",
"498",
"534",
"582",
"606",
"618",
"642",
"654",
"678",
"762",
"786",
"822",
"834",
"894",
"906",
"942",
"978",
"1002",
"1038",
"1074",
"1086",
"1146",
"1158",
"1182",
"1194",
"1266",
"1338",
"1362",
"1374",
"1398",
"1434",
"1446",
"1506",
"1542",
"1578",
"1614",
"1626",
"1662",
"1686",
"1698",
"1758",
"1842",
"1866"
] | [
"nonn"
] | 8 | 1 | 1 | [
"A008588",
"A091191",
"A378664",
"A378738",
"A378742"
] | null | Antti Karttunen, Dec 07 2024 | 2024-12-07T19:30:20 | oeisdata/seq/A378/A378742.seq | 37bb3e5577f7d04fd635366c74466b27 |
A378743 | a(n) is the least m for which bigomega(A246281(m)) = n. | [
"1",
"2",
"22",
"374",
"14641",
"594473",
"24137569",
"1194099737"
] | [
"nonn",
"more"
] | 16 | 0 | 2 | [
"A001222",
"A001359",
"A003961",
"A246281",
"A378743"
] | null | Antti Karttunen, Dec 07 2024 | 2024-12-08T10:20:18 | oeisdata/seq/A378/A378743.seq | 7f413db9c345279f32fd96e8f3cc1e8d |
A378744 | The least k such that prime(1+n)^k > 2 * prime(n)^k. | [
"2",
"2",
"3",
"2",
"5",
"3",
"7",
"4",
"3",
"11",
"4",
"7",
"15",
"8",
"6",
"7",
"21",
"8",
"12",
"25",
"9",
"15",
"10",
"9",
"18",
"36",
"19",
"38",
"20",
"6",
"23",
"16",
"48",
"10",
"52",
"18",
"19",
"29",
"20",
"21",
"63",
"13",
"67",
"34",
"69",
"12",
"13",
"39",
"80",
"41",
"28",
"84",
"18",
"30",
"31",
"31",
"94",
"32",
"49",
"98",
"20",
"15",
"54",
"109",
"55",
"17",
"39",
"24",
"121",
"61",
"42",
"32",
"43",
"44",
"67",
"45",
"35",
"70",
"36",
"29",
"146",
"30",
"150"
] | [
"nonn"
] | 21 | 1 | 1 | [
"A000040",
"A001359",
"A003961",
"A337372",
"A341609",
"A378744",
"A378745"
] | null | Antti Karttunen, Dec 08 2024 | 2024-12-10T11:59:13 | oeisdata/seq/A378/A378744.seq | 55e6e3114e8c19912e7b2c6f840069fd |
A378745 | a(n) = prime(n)^A378744(n). | [
"4",
"9",
"125",
"49",
"161051",
"2197",
"410338673",
"130321",
"12167",
"12200509765705829",
"923521",
"94931877133",
"1555098314991537910888601",
"11688200277601",
"10779215329",
"1174711139837",
"15413179794770734626518662321719325259",
"191707312997281",
"8182718904632857144561",
"19118715823042429491729074582041753821507871751",
"58871586708267913"
] | [
"nonn"
] | 7 | 1 | 1 | [
"A000040",
"A003961",
"A337372",
"A378744",
"A378745",
"A378746"
] | null | Antti Karttunen, Dec 08 2024 | 2024-12-08T17:17:50 | oeisdata/seq/A378/A378745.seq | 5d20f0a0965af6c2e75eb13c30243548 |
A378746 | a(n) = Product{i=n..primepi(2*prime(n))} prime(i). | [
"6",
"15",
"35",
"1001",
"46189",
"96577",
"6678671",
"14535931",
"1348781387",
"146078888479",
"18128893780549",
"203079283326684719",
"433601713048867373",
"877779077635511999",
"1816798556036292277",
"39006703653387621491281",
"969956148531489825059765363",
"16439934720872708899318057",
"4483790064773102589474664169",
"1274400211992152128527851190601"
] | [
"nonn"
] | 7 | 1 | 1 | [
"A001222",
"A003961",
"A007741",
"A063124",
"A097889",
"A337372",
"A378745",
"A378746"
] | null | Antti Karttunen, Dec 08 2024 | 2024-12-08T17:18:01 | oeisdata/seq/A378/A378746.seq | 2c6c6976cb78664bf92816be852b2a5a |
A378747 | a(n) = A048673(n) - A001065(n). | [
"1",
"1",
"2",
"2",
"3",
"2",
"5",
"7",
"9",
"3",
"6",
"7",
"8",
"7",
"9",
"26",
"9",
"17",
"11",
"10",
"17",
"6",
"14",
"32",
"19",
"10",
"50",
"22",
"15",
"11",
"18",
"91",
"18",
"9",
"26",
"58",
"20",
"13",
"26",
"45",
"21",
"29",
"23",
"19",
"55",
"18",
"26",
"127",
"53",
"31",
"27",
"31",
"29",
"122",
"29",
"85",
"35",
"15",
"30",
"50",
"33",
"22",
"97",
"302",
"41",
"20",
"35",
"28",
"46",
"42",
"36",
"215",
"39",
"22",
"74",
"40",
"53",
"38",
"41",
"178",
"273",
"21"
] | [
"nonn"
] | 12 | 1 | 3 | [
"A000203",
"A001065",
"A003961",
"A048673",
"A286385",
"A337378",
"A337379",
"A349573",
"A378747",
"A378748",
"A378749"
] | null | Antti Karttunen, Dec 09 2024 | 2024-12-09T15:16:08 | oeisdata/seq/A378/A378747.seq | 43bc7e85459070af40a648b22d1a0990 |
A378748 | Möbius transform of A378747. | [
"1",
"0",
"1",
"1",
"2",
"0",
"4",
"5",
"7",
"0",
"5",
"4",
"7",
"2",
"5",
"19",
"8",
"8",
"10",
"6",
"11",
"0",
"13",
"20",
"16",
"2",
"41",
"14",
"14",
"2",
"17",
"65",
"11",
"0",
"19",
"36",
"19",
"2",
"17",
"30",
"20",
"10",
"22",
"12",
"39",
"4",
"25",
"76",
"48",
"12",
"17",
"20",
"28",
"64",
"21",
"58",
"23",
"0",
"29",
"28",
"32",
"4",
"73",
"211",
"31",
"2",
"34",
"18",
"31",
"14",
"35",
"132",
"38",
"2",
"49",
"26",
"43",
"10",
"40",
"114",
"223",
"0",
"43",
"60",
"33",
"2"
] | [
"nonn"
] | 12 | 1 | 5 | [
"A000010",
"A003961",
"A003972",
"A008683",
"A048673",
"A051953",
"A108605",
"A378521",
"A378747",
"A378748"
] | null | Antti Karttunen, Dec 09 2024 | 2024-12-09T15:16:12 | oeisdata/seq/A378/A378748.seq | 21e48d65fb7847038dcd405282a90a5e |
A378749 | Dirichlet inverse of A378747, where A378747(n) = A048673(n) - A001065(n). | [
"1",
"-1",
"-2",
"-1",
"-3",
"2",
"-5",
"-4",
"-5",
"3",
"-6",
"-1",
"-8",
"3",
"3",
"-13",
"-9",
"-3",
"-11",
"-1",
"3",
"6",
"-14",
"-4",
"-10",
"6",
"-22",
"-3",
"-15",
"-5",
"-18",
"-37",
"6",
"9",
"4",
"-7",
"-20",
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"6",
"-4",
"-21",
"-7",
"-23",
"-1",
"-1",
"10",
"-26",
"-10",
"-28",
"-2",
"9",
"-3",
"-29",
"-18",
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"-4",
"9",
"15",
"-30",
"3",
"-33",
"14",
"1",
"-94",
"7",
"-8",
"-35",
"-1",
"10",
"-8",
"-36",
"4",
"-39",
"18",
"2",
"-3",
"7",
"-10",
"-41"
] | [
"sign"
] | 8 | 1 | 3 | [
"A001065",
"A048673",
"A378747",
"A378749",
"A378750"
] | null | Antti Karttunen, Dec 09 2024 | 2024-12-09T15:25:50 | oeisdata/seq/A378/A378749.seq | d996730e573d6dcc6b11a99e8b5b4afc |
A378750 | Dirichlet inverse of A377984, where A377984(n) = 2*sigma(n) - A003961(n). | [
"1",
"-3",
"-3",
"4",
"-5",
"9",
"-5",
"0",
"8",
"15",
"-11",
"-8",
"-11",
"15",
"17",
"8",
"-17",
"-24",
"-17",
"-16",
"21",
"33",
"-19",
"0",
"12",
"33",
"24",
"-8",
"-29",
"-51",
"-27",
"24",
"35",
"51",
"31",
"56",
"-35",
"51",
"39",
"0",
"-41",
"-63",
"-41",
"-40",
"-28",
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"-43",
"0",
"32",
"-36",
"53",
"-32",
"-49",
"-72",
"57",
"0",
"57",
"87",
"-59",
"48",
"-57",
"81",
"-4",
"88",
"61",
"-105",
"-65",
"-64",
"67",
"-93",
"-71",
"0",
"-69",
"105"
] | [
"sign"
] | 6 | 1 | 2 | [
"A000203",
"A003961",
"A377984",
"A378749",
"A378750"
] | null | Antti Karttunen, Dec 09 2024 | 2024-12-09T22:04:26 | oeisdata/seq/A378/A378750.seq | 1d8352849f3b79df5ee751f2a077ec92 |
A378751 | a(n) = A000203(n) - A048673(n). | [
"0",
"1",
"1",
"2",
"2",
"4",
"2",
"1",
"0",
"7",
"5",
"5",
"5",
"7",
"6",
"-10",
"8",
"1",
"8",
"10",
"4",
"16",
"9",
"-8",
"6",
"16",
"-23",
"6",
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"-22",
"17",
"25",
"13",
"-5",
"20",
"13",
"20",
"25",
"-10",
"28",
"21",
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"-4",
"19",
"24",
"21",
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"43",
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"40",
"-34",
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"24",
"46",
"32",
"40",
"23",
"28",
"35",
"-143",
"34",
"52",
"1",
"36",
"24",
"40",
"38",
"-98",
"-192"
] | [
"sign"
] | 10 | 1 | 4 | [
"A000203",
"A048673",
"A337378",
"A337379",
"A377984",
"A378747",
"A378751"
] | null | Antti Karttunen, Dec 09 2024 | 2024-12-09T19:45:53 | oeisdata/seq/A378/A378751.seq | 515be2db3fd8150f8bb8df4132c617f2 |
A378752 | a(n) = 2*sigma(n) - sigma(A003961(n)), where A003961 is fully multiplicative with a(prime(i)) = prime(i+1). | [
"1",
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] | [
"sign"
] | 7 | 1 | 2 | [
"A000203",
"A003961",
"A003973",
"A337381",
"A337382",
"A337384",
"A378752"
] | null | Antti Karttunen, Dec 09 2024 | 2024-12-09T19:45:35 | oeisdata/seq/A378/A378752.seq | fdc58b871778843a7a5c5191c55ef5e5 |
A378753 | Dirichlet inverse of A378752, where A378752(n) = 2*sigma(n) - sigma(A003961(n)), and A003961 is fully multiplicative with a(prime(i)) = prime(i+1). | [
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] | [
"sign"
] | 6 | 1 | 2 | [
"A000203",
"A003973",
"A378752",
"A378753"
] | null | Antti Karttunen, Dec 11 2024 | 2024-12-11T20:17:55 | oeisdata/seq/A378/A378753.seq | df6034090d9540595f63d532a41458ad |
A378754 | Dirichlet convolution of -A252748 and A323910. | [
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] | [
"sign"
] | 7 | 1 | 4 | [
"A033879",
"A252748",
"A323910",
"A378754",
"A378755"
] | null | Antti Karttunen, Dec 11 2024 | 2024-12-11T20:17:59 | oeisdata/seq/A378/A378754.seq | 756fbbfa7c1c234a254a5f14240d12d6 |
A378755 | Dirichlet convolution of A033879 and A346248. | [
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"3",
"326",
"571",
"2",
"5",
"318",
"7",
"6",
"7"
] | [
"nonn"
] | 6 | 1 | 4 | [
"A033879",
"A346248",
"A378754",
"A378755"
] | null | Antti Karttunen, Dec 11 2024 | 2024-12-11T20:18:03 | oeisdata/seq/A378/A378755.seq | 1cce2a6c1ac537b43cf5b98cb1543bef |
A378756 | Dirichlet convolution of A046692 and A005187, where A046692 is the Dirichlet inverse of sigma. | [
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] | [
"sign"
] | 7 | 1 | 5 | [
"A005187",
"A046692",
"A294898",
"A378756",
"A378757"
] | null | Antti Karttunen, Dec 15 2024 | 2024-12-15T21:09:28 | oeisdata/seq/A378/A378756.seq | ccc8edc1fca5cb4261b6a37b065cd77f |
A378757 | Dirichlet convolution of sigma and the Dirichlet inverse of A005187 (A346237). | [
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"0",
"80",
"-74",
"-73",
"0",
"2",
"76",
"-78"
] | [
"sign"
] | 7 | 1 | 5 | [
"A000203",
"A005187",
"A294898",
"A346237",
"A378756",
"A378757"
] | null | Antti Karttunen, Dec 15 2024 | 2024-12-15T21:09:34 | oeisdata/seq/A378/A378757.seq | e76228a3210ccb8d914946a2dd7895da |
A378758 | Number of 1's required to build n using +, -, and ^. | [
"1",
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"6",
"5",
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"7",
"8",
"9",
"10",
"11",
"12",
"13",
"13",
"12",
"12",
"13"
] | [
"nonn"
] | 12 | 1 | 2 | [
"A000027",
"A005245",
"A025280",
"A091333",
"A091334",
"A348089",
"A348262",
"A378758",
"A378759"
] | null | Jake Bird, Dec 06 2024 | 2024-12-21T00:51:30 | oeisdata/seq/A378/A378758.seq | 1bd971e461913f5e06c16fb5636188ea |
A378759 | Number of 1's required to build n using +, /, and ^. | [
"1",
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"3",
"4",
"5",
"6",
"7",
"5",
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"7",
"8",
"9",
"10",
"11",
"12",
"13",
"14",
"12"
] | [
"nonn"
] | 8 | 1 | 2 | [
"A000027",
"A005245",
"A025280",
"A091333",
"A091334",
"A348089",
"A348262",
"A378758",
"A378759"
] | null | Jake Bird, Dec 06 2024 | 2024-12-21T00:51:47 | oeisdata/seq/A378/A378759.seq | c8371e6997408ba25db75874162b29db |
A378760 | Smallest sum b_1 + .. + b_k among the sequences of positive integers b_1, b_2, ..., b_k such that 1 + b_1*(1 + b_2*(...(1 + b_k) ... )) = n. | [
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"11",
"11",
"11",
"12",
"12",
"13",
"11",
"11"
] | [
"easy",
"nonn"
] | 27 | 1 | 3 | [
"A003238",
"A378760"
] | null | Matthieu Pluntz, Dec 06 2024 | 2025-01-26T09:06:10 | oeisdata/seq/A378/A378760.seq | 4cf978051081f238368fc24f8e925789 |
A378761 | Irregular triangle read by rows: T(n,k) for k <= n/2 is the number of partitions of the repunit A002275(n) into k nonzero complementary binary vectors having a common divisor > 1 in base 10. | [
"1",
"1",
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"0",
"0",
"0",
"0",
"0",
"0",
"1",
"75433"
] | [
"nonn",
"base",
"tabf"
] | 46 | 2 | 4 | [
"A002275",
"A004023",
"A378154",
"A378511",
"A378761"
] | null | Dmytro Inosov, Dec 06 2024 | 2024-12-21T11:08:00 | oeisdata/seq/A378/A378761.seq | 9d868512be9b5ad46feaf16f7a93d0a9 |
A378762 | a(n) = A378200(A378200(A378200(n))). | [
"1",
"2",
"3",
"6",
"5",
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"62",
"61",
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"59",
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] | [
"nonn",
"tabf"
] | 23 | 1 | 2 | [
"A000027",
"A000384",
"A016813",
"A370655",
"A373498",
"A374447",
"A374494",
"A374531",
"A375602",
"A375725",
"A378200",
"A378684",
"A378705",
"A378762",
"A379342"
] | null | Boris Putievskiy, Dec 06 2024 | 2025-03-19T10:10:09 | oeisdata/seq/A378/A378762.seq | f81b34412318965cb409e40426b713d1 |
A378763 | Lower matching number for the n X n torus grid graph. | [
"3",
"6",
"9",
"12",
"17",
"22",
"27",
"34",
"42",
"48",
"58",
"67",
"75",
"87"
] | [
"nonn",
"more",
"hard"
] | 24 | 3 | 1 | [
"A008810",
"A280984",
"A378763"
] | null | Eric W. Weisstein, Dec 06 2024 | 2024-12-19T13:47:08 | oeisdata/seq/A378/A378763.seq | 112705d1eecf0160ba0c73def8e1cae3 |
A378764 | Sum of the semiprimes which are less than or equal to n minus the sum of the primes which are less than or equal to n. | [
"0",
"-2",
"-5",
"-1",
"-6",
"0",
"-7",
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"2",
"12",
"1",
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"208",
"208",
"208",
"273",
"273",
"206",
"206",
"275",
"275"
] | [
"sign"
] | 15 | 1 | 2 | [
"A000040",
"A001358",
"A007504",
"A062198",
"A243906",
"A378764"
] | null | Robert G. Wilson v and Luca Bencini-Tibo, Dec 20 2024 | 2025-01-11T19:21:52 | oeisdata/seq/A378/A378764.seq | aeb2a0e6e2c3df42e50bc14dc9aa1333 |
A378765 | (Exponent of the highest power of 2 that divides n!), reduced modulo 10. | [
"0",
"0",
"1",
"1",
"3",
"3",
"4",
"4",
"7",
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"8",
"8",
"0",
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"4",
"4",
"5",
"5",
"7",
"7",
"8",
"8",
"1"
] | [
"easy",
"nonn"
] | 26 | 0 | 5 | [
"A011371",
"A095190",
"A218451",
"A378765"
] | null | Robert G. Wilson v, Dec 28 2024 | 2025-01-12T23:56:55 | oeisdata/seq/A378/A378765.seq | 175f650bc563b7b21ec2b84f2fa5f7a2 |
A378766 | Lexicographically earliest infinite sequence of distinct positive numbers with the property that n is a member of the sequence iff a(n) is powerful (in A001694). | [
"1",
"3",
"4",
"8",
"6",
"9",
"10",
"16",
"25",
"27",
"12",
"32",
"14",
"36",
"17",
"49",
"64",
"19",
"72",
"21",
"81",
"23",
"100",
"26",
"108",
"121",
"125",
"29",
"128",
"31",
"144",
"169",
"34",
"196",
"37",
"200",
"216",
"39",
"225",
"41",
"243",
"43",
"256",
"45",
"288",
"47",
"289",
"50",
"324",
"343",
"52",
"361",
"54",
"392",
"56",
"400",
"58",
"432",
"60",
"441",
"62",
"484"
] | [
"nonn",
"easy"
] | 6 | 1 | 2 | [
"A001694",
"A052485",
"A121053",
"A378766",
"A379051",
"A379053"
] | null | Michael De Vlieger, Dec 18 2024 | 2024-12-20T11:37:33 | oeisdata/seq/A378/A378766.seq | 868b2722b6c9c0b1acf9dd79c9012782 |
A378767 | Numbers k that are not prime powers which are divisible by a cube greater than 1. | [
"24",
"40",
"48",
"54",
"56",
"72",
"80",
"88",
"96",
"104",
"108",
"112",
"120",
"135",
"136",
"144",
"152",
"160",
"162",
"168",
"176",
"184",
"189",
"192",
"200",
"208",
"216",
"224",
"232",
"240",
"248",
"250",
"264",
"270",
"272",
"280",
"288",
"296",
"297",
"304",
"312",
"320",
"324",
"328",
"336",
"344",
"351",
"352",
"360",
"368",
"375",
"376",
"378",
"384"
] | [
"nonn",
"easy"
] | 5 | 1 | 1 | [
"A024619",
"A046099",
"A126706",
"A362148",
"A372695",
"A378767"
] | null | Michael De Vlieger, Dec 06 2024 | 2024-12-08T17:28:17 | oeisdata/seq/A378/A378767.seq | fd04282542e42696c16ca4dea6182fe5 |
A378768 | Squares of powerful numbers that are not prime powers. | [
"1296",
"5184",
"10000",
"11664",
"20736",
"38416",
"40000",
"46656",
"50625",
"82944",
"104976",
"153664",
"160000",
"186624",
"194481",
"234256",
"250000",
"331776",
"419904",
"455625",
"456976",
"614656",
"640000",
"746496",
"810000",
"937024",
"944784",
"1000000",
"1185921",
"1265625",
"1327104",
"1336336",
"1500625",
"1679616"
] | [
"nonn",
"easy"
] | 16 | 1 | 1 | [
"A000290",
"A001694",
"A013662",
"A013664",
"A013670",
"A126706",
"A286708",
"A372695",
"A378768"
] | null | Michael De Vlieger, Dec 06 2024 | 2024-12-10T09:58:47 | oeisdata/seq/A378/A378768.seq | 826905a37ec206095a2001e4590a1d05 |
A378769 | Intersection of A375055 and A376936. | [
"5400",
"9000",
"10584",
"10800",
"13500",
"16200",
"18000",
"21168",
"21600",
"24696",
"26136",
"27000",
"31752",
"32400",
"36000",
"36504",
"37044",
"40500",
"42336",
"43200",
"45000",
"48600",
"49000",
"49392",
"52272",
"54000",
"62424",
"63504",
"64800",
"67500",
"68600",
"72000",
"73008",
"74088",
"77976",
"78408",
"81000",
"84672"
] | [
"nonn",
"easy"
] | 11 | 1 | 1 | [
"A001694",
"A024619",
"A082020",
"A082695",
"A126706",
"A375055",
"A376936",
"A378767",
"A378769",
"A378900"
] | null | Michael De Vlieger, Dec 13 2024 | 2024-12-21T11:09:42 | oeisdata/seq/A378/A378769.seq | ec61e55554f911d104b31bf002b7b0ff |
A378770 | Decimal expansion of 7*sqrt(3)/27. | [
"4",
"4",
"9",
"0",
"5",
"0",
"2",
"0",
"9",
"3",
"6",
"9",
"7",
"0",
"8",
"9",
"2",
"7",
"9",
"5",
"1",
"5",
"6",
"0",
"1",
"6",
"2",
"6",
"1",
"2",
"6",
"3",
"3",
"5",
"7",
"6",
"6",
"1",
"4",
"8",
"0",
"1",
"3",
"6",
"2",
"0",
"9",
"8",
"9",
"8",
"7",
"5",
"7",
"0",
"2",
"3",
"6",
"6",
"9",
"0",
"6",
"9",
"8",
"3",
"7",
"6",
"4",
"2",
"7",
"0",
"7",
"8",
"4",
"5",
"7",
"8",
"3",
"7",
"0",
"4",
"6",
"6",
"5",
"0",
"6",
"6",
"7",
"5",
"2",
"9",
"9",
"0",
"0",
"0",
"2",
"7",
"4",
"0",
"8",
"5"
] | [
"nonn",
"cons",
"easy"
] | 20 | 0 | 1 | [
"A002194",
"A378770"
] | null | Stefano Spezia, Dec 22 2024 | 2024-12-22T15:56:29 | oeisdata/seq/A378/A378770.seq | 2017ddb54c90786cb9cb8f4ff4f73c95 |
A378771 | a(n) is the least k such that the last k digits of m = A020666(n)^n contain all 10 possible digits (0 through 9). | [
"10",
"10",
"10",
"11",
"13",
"11",
"13",
"17",
"15",
"16",
"15",
"15",
"16",
"18",
"17",
"15",
"17",
"15",
"13",
"16",
"17",
"15",
"24",
"17",
"23",
"16",
"19",
"20",
"20",
"22",
"22",
"25",
"32",
"17",
"20",
"23",
"20",
"19",
"19",
"23",
"19",
"14",
"21",
"19",
"17",
"25",
"22",
"17",
"27",
"19",
"24",
"13",
"20",
"28",
"18",
"33",
"26",
"18",
"33",
"22",
"23",
"20",
"25",
"25",
"25",
"22"
] | [
"nonn",
"easy",
"base"
] | 16 | 1 | 1 | [
"A005054",
"A020666",
"A378771"
] | null | David A. Corneth, Dec 06 2024 | 2024-12-12T18:27:25 | oeisdata/seq/A378/A378771.seq | c23d70e9fb275fe3656181fd9de68d30 |
A378772 | Number of weakly decreasing sequences of positive integers [p1, p2, ..., p_k] satisfying n = (1 + p1*(1 + p2*(... (1 + p_k) ...))). | [
"1",
"1",
"2",
"2",
"3",
"2",
"5",
"2",
"4",
"4",
"5",
"2",
"8",
"2",
"6",
"6",
"6",
"2",
"8",
"2",
"9",
"8",
"6",
"2",
"10",
"5",
"5",
"6",
"10",
"2",
"17",
"2",
"7",
"7",
"5",
"9",
"14",
"2",
"6",
"8",
"13",
"2",
"15",
"2",
"9",
"14",
"7",
"2",
"15",
"7",
"11",
"6",
"12",
"2",
"14",
"9",
"14",
"8",
"5",
"2",
"22",
"2",
"8",
"14",
"11",
"11",
"18",
"2",
"10",
"8",
"18",
"2",
"19",
"2",
"5",
"14",
"10",
"11",
"19"
] | [
"nonn"
] | 11 | 1 | 3 | [
"A000522",
"A003238",
"A378772"
] | null | Alois P. Heinz, Dec 06 2024 | 2024-12-11T17:57:01 | oeisdata/seq/A378/A378772.seq | 9eb915fe17f05aa23a79c4bd1487c593 |
A378773 | Lower matching number of the n-diagonal intersection graph. | [
"1",
"2",
"4",
"6",
"14",
"20",
"45",
"55",
"112",
"99",
"238",
"245"
] | [
"nonn",
"more"
] | 14 | 3 | 2 | null | null | Eric W. Weisstein, Dec 06 2024 | 2024-12-07T14:56:36 | oeisdata/seq/A378/A378773.seq | 103b82ae4a1f1aa098a85f69aa83543c |
A378774 | Prime numbers with monotonically increasing digits, increasing by only 0 or 1. | [
"2",
"3",
"5",
"7",
"11",
"23",
"67",
"89",
"223",
"233",
"677",
"1123",
"1223",
"2333",
"4567",
"7789",
"8999",
"23333",
"45667",
"45677",
"55667",
"67777",
"67789",
"77899",
"78889",
"112223",
"344567",
"445567",
"555677",
"556789",
"566677",
"567899",
"666667",
"788999",
"1112333",
"2222333",
"3445567",
"3445667",
"3455567",
"3456667",
"4455667",
"4456789",
"4556777"
] | [
"nonn",
"base",
"look"
] | 19 | 1 | 1 | [
"A028864",
"A378774",
"A378775"
] | null | Randy L. Ekl, Dec 06 2024 | 2025-02-09T13:28:24 | oeisdata/seq/A378/A378774.seq | f991dd6c8d3806632629a74c6647419d |
A378775 | Prime numbers with monotonically decreasing digits, differing by at most 1. | [
"2",
"3",
"5",
"7",
"11",
"43",
"211",
"433",
"443",
"877",
"887",
"2111",
"2221",
"3221",
"5443",
"8887",
"9887",
"22111",
"33211",
"43321",
"54443",
"65543",
"76543",
"98887",
"99877",
"322111",
"332221",
"443221",
"444443",
"766543",
"888887",
"988877",
"2221111",
"3221111",
"3222211",
"3222221",
"3333221",
"4322221",
"4433333",
"4443221"
] | [
"nonn",
"base",
"look"
] | 19 | 1 | 1 | [
"A028864",
"A378774",
"A378775",
"A378808"
] | null | Randy L. Ekl, Dec 06 2024 | 2025-02-09T13:35:49 | oeisdata/seq/A378/A378775.seq | a60957c63ec45337d236f4234a43bb37 |
A378776 | Lexicographically earliest sequence of positive integers such that each multiset enclosed by a pair of equal terms, including the endpoints, is distinct. | [
"1",
"1",
"2",
"1",
"2",
"2",
"1",
"3",
"1",
"2",
"3",
"1",
"2",
"4",
"1",
"2",
"3",
"2",
"3",
"1",
"3",
"2",
"4",
"2",
"1",
"3",
"3",
"4",
"1",
"3",
"4",
"1",
"4",
"1",
"2",
"3",
"4",
"1",
"2",
"4",
"4",
"1",
"2",
"5",
"1",
"2",
"3",
"4",
"2",
"3",
"4",
"1",
"5",
"1",
"2",
"3",
"4",
"3",
"1",
"5",
"2",
"3",
"1",
"4",
"5",
"1",
"3",
"2",
"4",
"6",
"1",
"2",
"3",
"4",
"5",
"1",
"2",
"3",
"5",
"2",
"1",
"4",
"5",
"2",
"1",
"4",
"6",
"1"
] | [
"nonn"
] | 17 | 1 | 3 | [
"A366625",
"A378776"
] | null | Neal Gersh Tolunsky, Dec 06 2024 | 2024-12-14T20:38:47 | oeisdata/seq/A378/A378776.seq | ee456558431301ac10e342c40c935ad2 |
A378777 | a(n) = n^2 * binomial(3*n, n). | [
"0",
"3",
"60",
"756",
"7920",
"75075",
"668304",
"5697720",
"47070144",
"379632825",
"3004501500",
"23417943120",
"180241588800",
"1372689900036",
"10360604899680",
"77595170756400",
"577241321893632",
"4268838966063525",
"31404136939468020",
"229951212925133700",
"1676737802322198000",
"12180171012442098435"
] | [
"nonn",
"easy"
] | 9 | 0 | 2 | [
"A005809",
"A090763",
"A144485",
"A378777"
] | null | Amiram Eldar, Dec 07 2024 | 2024-12-07T05:42:48 | oeisdata/seq/A378/A378777.seq | 0d92da5500bb364188872cdfa01e34ae |
A378778 | a(n) = n^2 * 2^n * binomial(3*n, n). | [
"0",
"6",
"240",
"6048",
"126720",
"2402400",
"42771456",
"729308160",
"12049956864",
"194372006400",
"3076609536000",
"47959947509760",
"738269547724800",
"11245075661094912",
"169748150676357120",
"2542638555345715200",
"37830087271621066752",
"559525260959878348800",
"8232406073859904634880",
"120560661522092497305600"
] | [
"nonn",
"easy"
] | 11 | 0 | 2 | [
"A005809",
"A007758",
"A228484",
"A378778",
"A378780"
] | null | Amiram Eldar, Dec 07 2024 | 2025-03-31T02:54:52 | oeisdata/seq/A378/A378778.seq | 87a5e1dcf8b3df1440cde50a62f426b9 |
A378779 | a(n) = n^2 * 4^n * binomial(3*n, n). | [
"0",
"12",
"960",
"48384",
"2027520",
"76876800",
"2737373184",
"93351444480",
"3084788957184",
"99518467276800",
"3150448164864000",
"98221972499988480",
"3023952067480780800",
"92119659815689519104",
"2781153700681435054080",
"83317180181568395673600",
"2479232599432958230659072",
"73338095004533174933913600"
] | [
"nonn",
"easy"
] | 11 | 0 | 2 | [
"A005809",
"A006588",
"A128782",
"A378779"
] | null | Amiram Eldar, Dec 07 2024 | 2025-03-31T02:55:33 | oeisdata/seq/A378/A378779.seq | 4d1864ea513bda367afad829e0dae760 |
A378780 | a(n) = n * 2^n * binomial(3*n, n). | [
"0",
"6",
"120",
"2016",
"31680",
"480480",
"7128576",
"104186880",
"1506244608",
"21596889600",
"307660953600",
"4359995228160",
"61522462310400",
"865005820084224",
"12124867905454080",
"169509237023047680",
"2364380454476316672",
"32913250644698726400",
"457355892992216924160",
"6345297974846973542400"
] | [
"nonn",
"easy"
] | 11 | 0 | 2 | [
"A005809",
"A036289",
"A228484",
"A378780"
] | null | Amiram Eldar, Dec 07 2024 | 2025-03-31T02:55:23 | oeisdata/seq/A378/A378780.seq | e0399fdbf34ca102c82a4a996386ddd7 |
A378781 | a(n) = n^3 * 2^n * binomial(3*n, n) / 3. | [
"0",
"2",
"160",
"6048",
"168960",
"4004000",
"85542912",
"1701719040",
"32133218304",
"583116019200",
"10255365120000",
"175853140869120",
"2953078190899200",
"48728661198077952",
"792158036489666560",
"12713192776728576000",
"201760465448645689344",
"3170643145439310643200",
"49394436443159427809280"
] | [
"nonn",
"easy",
"changed"
] | 15 | 0 | 2 | [
"A002117",
"A005809",
"A006752",
"A128789",
"A378778",
"A378780",
"A378781"
] | null | Amiram Eldar, Dec 07 2024 | 2025-04-26T06:01:04 | oeisdata/seq/A378/A378781.seq | 74397caf1a604d1569c89c8228722839 |
A378782 | a(1) = 1. For n > 1, a(n) is the number of terms a(i), 1 <= i <= n-1 where the sum of the digits of a(i) is <= sum of digits of a(n-1). | [
"1",
"1",
"2",
"3",
"4",
"5",
"6",
"7",
"8",
"9",
"10",
"3",
"6",
"10",
"4",
"9",
"16",
"14",
"11",
"6",
"15",
"16",
"19",
"23",
"13",
"11",
"7",
"23",
"16",
"25",
"26",
"28",
"32",
"17",
"30",
"10",
"5",
"20",
"9",
"37",
"40",
"16",
"33",
"27",
"41",
"23",
"24",
"30",
"13",
"18",
"47",
"51",
"33",
"34",
"42",
"35",
"47",
"57",
"58",
"59",
"60",
"36",
"54",
"55",
"59",
"65",
"62",
"49",
"66",
"65"
] | [
"nonn",
"base",
"easy"
] | 18 | 1 | 3 | [
"A007953",
"A378293",
"A378782"
] | null | David James Sycamore, Dec 07 2024 | 2024-12-08T17:23:52 | oeisdata/seq/A378/A378782.seq | 586d6ff3f0afc75b09aea8bd9d2d11cc |
A378783 | Triangular array T(n,k) read by rows: T(n, k) = c_k(n+1). The sequence c_k(m) has the ordinary generating function C_k(x) which satisfies C_k(x) = 1/(1+C_k(x)*Sum_{t=0..k} x^(t+1)). | [
"-1",
"2",
"1",
"-5",
"-1",
"-2",
"14",
"1",
"5",
"4",
"-42",
"-1",
"-12",
"-8",
"-9",
"132",
"1",
"29",
"18",
"22",
"21",
"-429",
"-1",
"-73",
"-43",
"-54",
"-50",
"-51",
"1430",
"1",
"190",
"105",
"135",
"124",
"128",
"127",
"-4862",
"-1",
"-505",
"-262",
"-345",
"-315",
"-326",
"-322",
"-323",
"16796",
"1",
"1363",
"666",
"896",
"813",
"843",
"832",
"836",
"835"
] | [
"sign",
"tabl"
] | 19 | 0 | 2 | [
"A000108",
"A001006",
"A152171",
"A166587",
"A168491",
"A378783",
"A378816"
] | null | Thomas Scheuerle, Dec 07 2024 | 2024-12-21T00:49:45 | oeisdata/seq/A378/A378783.seq | 2f676f0a8ea3c8690fd3d430734985a1 |
A378784 | a(1)=1, a(2)=2, then the terms from a(2^k + 1) to a(2^(k+1)) are the first 2^k terms in reverse order, increased by a(2^k). | [
"1",
"2",
"4",
"3",
"6",
"7",
"5",
"4",
"8",
"9",
"11",
"10",
"7",
"8",
"6",
"5",
"10",
"11",
"13",
"12",
"15",
"16",
"14",
"13",
"9",
"10",
"12",
"11",
"8",
"9",
"7",
"6",
"12",
"13",
"15",
"14",
"17",
"18",
"16",
"15",
"19",
"20",
"22",
"21",
"18",
"19",
"17",
"16",
"11",
"12",
"14",
"13",
"16",
"17",
"15",
"14",
"10",
"11",
"13",
"12",
"9",
"10",
"8",
"7",
"14",
"15",
"17",
"16",
"19",
"20",
"18",
"17",
"21",
"22",
"24"
] | [
"nonn"
] | 10 | 1 | 2 | [
"A378784",
"A378785"
] | null | Ivan Neretin, Dec 07 2024 | 2024-12-21T05:49:19 | oeisdata/seq/A378/A378784.seq | 6ba061979d91d7d815430eb357cff37f |
A378785 | a(1)=1, a(2)=2, then when n is a Fibonacci number F(k+1), the next F(k) terms are the first F(k) terms increased by a(n) and put in reverse order. | [
"1",
"2",
"3",
"5",
"4",
"7",
"6",
"5",
"9",
"10",
"8",
"7",
"6",
"11",
"12",
"13",
"10",
"11",
"9",
"8",
"7",
"13",
"14",
"15",
"17",
"16",
"12",
"13",
"14",
"11",
"12",
"10",
"9",
"8",
"15",
"16",
"17",
"19",
"18",
"21",
"20",
"19",
"14",
"15",
"16",
"18",
"17",
"13",
"14",
"15",
"12",
"13",
"11",
"10",
"9",
"17",
"18",
"19",
"21",
"20",
"23",
"22",
"21",
"25",
"26",
"24",
"23",
"22",
"16",
"17",
"18",
"20",
"19",
"22",
"21"
] | [
"nonn"
] | 9 | 1 | 2 | [
"A378784",
"A378785"
] | null | Ivan Neretin, Dec 07 2024 | 2024-12-21T05:49:22 | oeisdata/seq/A378/A378785.seq | 6808bd0769a0bf7d7484ff454c0c9170 |
A378786 | G.f. A(x) satisfies A(x) = 1 + x * (1+x)^2 * A(x)^4. | [
"1",
"1",
"6",
"39",
"296",
"2435",
"21138",
"190603",
"1767968",
"16761424",
"161697576",
"1582171216",
"15664531716",
"156637712953",
"1579664567130",
"16048129755157",
"164085811289360",
"1687224436103842",
"17436287104620980",
"181001686332329224",
"1886522317836670988",
"19734386503541838083"
] | [
"nonn"
] | 10 | 0 | 3 | [
"A002293",
"A002478",
"A073155",
"A365178",
"A366216",
"A366221",
"A366272",
"A378786"
] | null | Seiichi Manyama, Dec 07 2024 | 2024-12-07T10:41:39 | oeisdata/seq/A378/A378786.seq | fbef92eb6d8505f2299a4a87f363610a |
A378787 | G.f. A(x) satisfies A(x) = ( 1 + x * (1 + x*A(x)^2)^3 )^2. | [
"1",
"2",
"7",
"36",
"197",
"1184",
"7425",
"48308",
"322521",
"2198064",
"15227850",
"106924154",
"759245463",
"5442675080",
"39335090088",
"286296369000",
"2096706604597",
"15439417451928",
"114243931954962",
"849030345258990",
"6334510149389409",
"47428709540589036",
"356261301882333885"
] | [
"nonn"
] | 7 | 0 | 2 | [
"A069271",
"A137957",
"A371607",
"A371609",
"A378787"
] | null | Seiichi Manyama, Dec 07 2024 | 2024-12-07T10:41:43 | oeisdata/seq/A378/A378787.seq | 2988b559a82def9251f5c8a0c6189e74 |
A378788 | Lower matching number of the (n,n)-stacked book graph. | [
"1",
"2",
"4",
"6",
"10",
"14",
"17",
"24",
"30",
"34",
"44",
"52",
"57",
"70",
"80",
"86",
"102",
"114",
"121",
"140",
"154",
"162",
"184",
"200",
"209",
"234",
"252",
"262",
"290",
"310",
"321",
"352",
"374",
"386",
"420",
"444",
"457",
"494",
"520",
"534",
"574",
"602",
"617",
"660",
"690",
"706",
"752",
"784",
"801",
"850",
"884",
"902",
"954",
"990",
"1009"
] | [
"nonn"
] | 7 | 1 | 2 | null | null | Eric W. Weisstein, Dec 07 2024 | 2024-12-07T10:42:04 | oeisdata/seq/A378/A378788.seq | 26caf90a1bb5e0b05776e335d9b396c3 |
A378789 | Numbers k such that tau(k) == 1 (mod(2*(tau(k+prime(k)-1)))), where tau(k) = A000005(k). | [
"1",
"81",
"225",
"256",
"441",
"625",
"1521",
"2601",
"3025",
"3249",
"3364",
"4761",
"5929",
"6561",
"7225",
"8281",
"9025",
"9216",
"12321",
"13225",
"14161",
"17689",
"18225",
"20449",
"21025",
"25921",
"27556",
"31684",
"34225",
"41209",
"43681",
"45369",
"45796",
"46225",
"47089",
"47961",
"48841",
"50176",
"50625",
"57600",
"61009",
"62001",
"67081"
] | [
"nonn",
"easy"
] | 12 | 1 | 2 | [
"A000005",
"A000040",
"A378789",
"A378792",
"A378794"
] | null | Claude H. R. Dequatre, Dec 07 2024 | 2024-12-21T00:44:44 | oeisdata/seq/A378/A378789.seq | 76c22dbc1751c801c65cb18bf61dae8b |
A378790 | Lower matching number of the n X n king graph. | [
"0",
"2",
"3",
"6",
"8",
"14",
"17",
"24",
"28",
"38",
"43",
"54",
"60",
"74",
"81",
"96",
"104",
"122",
"131",
"150",
"160",
"182",
"193",
"216",
"228",
"254",
"267",
"294",
"308",
"338",
"353",
"384",
"400",
"434",
"451",
"486",
"504",
"542",
"561",
"600",
"620",
"662",
"683",
"726",
"748",
"794",
"817",
"864",
"888",
"938",
"963",
"1014",
"1040",
"1094",
"1121"
] | [
"nonn"
] | 6 | 1 | 2 | null | null | Eric W. Weisstein, Dec 07 2024 | 2024-12-07T10:42:13 | oeisdata/seq/A378/A378790.seq | c311d8b10ef9894f1e8b108004812ea3 |
A378791 | Decimal expansion of 2/(5*sqrt(11)). | [
"1",
"2",
"0",
"6",
"0",
"4",
"5",
"3",
"7",
"8",
"3",
"1",
"1",
"0",
"5",
"4",
"4",
"9",
"0",
"5",
"8",
"7",
"2",
"4",
"8",
"2",
"6",
"7",
"8",
"8",
"0",
"2",
"4",
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"0",
"3",
"2",
"4",
"6",
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"1",
"4",
"0",
"1",
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"5",
"7",
"7",
"9",
"4",
"6",
"7",
"6",
"2",
"5",
"6",
"6",
"7",
"9",
"3",
"5",
"0",
"7",
"6",
"7",
"8",
"7",
"2",
"1",
"6",
"8",
"8",
"2",
"2",
"1",
"4",
"7",
"0",
"4",
"8",
"9",
"7",
"1",
"2",
"3",
"0",
"6",
"6",
"9",
"0",
"5",
"9",
"2",
"1",
"0",
"5",
"6",
"9",
"1"
] | [
"nonn",
"cons",
"easy"
] | 10 | 0 | 2 | [
"A010468",
"A378791"
] | null | Stefano Spezia, Dec 07 2024 | 2024-12-08T02:42:52 | oeisdata/seq/A378/A378791.seq | 7ecf8fc44ec006fb7feca5dc1dc01002 |
A378792 | Numbers k such that tau(k) == 1 (mod(2*(tau(prime(k) - k + 1)))), where tau(k) = A000005(k). | [
"1",
"196",
"225",
"441",
"484",
"625",
"1089",
"1156",
"1225",
"1296",
"1444",
"3025",
"3249",
"3844",
"4225",
"5929",
"6561",
"7225",
"7396",
"7569",
"8281",
"11236",
"12321",
"13225",
"13924",
"15129",
"16641",
"17689",
"20164",
"21025",
"24025",
"25281",
"25600",
"34225",
"34969",
"40401",
"42025",
"47089",
"50625",
"51076",
"55225"
] | [
"nonn",
"easy"
] | 17 | 1 | 2 | [
"A000005",
"A000040",
"A011757",
"A378789",
"A378792",
"A378794"
] | null | Claude H. R. Dequatre, Dec 07 2024 | 2024-12-21T00:44:57 | oeisdata/seq/A378/A378792.seq | 7d9f033c0cd3a10dcc36cb64d7868f08 |
A378793 | Decimal expansion of 16/(9*sqrt(1609)). | [
"0",
"4",
"4",
"3",
"1",
"9",
"9",
"6",
"9",
"3",
"2",
"8",
"3",
"7",
"5",
"8",
"3",
"9",
"4",
"4",
"2",
"5",
"7",
"8",
"0",
"5",
"8",
"3",
"9",
"1",
"0",
"0",
"1",
"4",
"6",
"1",
"9",
"0",
"3",
"4",
"0",
"7",
"7",
"1",
"1",
"9",
"5",
"1",
"3",
"2",
"7",
"6",
"1",
"1",
"9",
"3",
"8",
"3",
"6",
"7",
"1",
"8",
"2",
"0",
"5",
"3",
"9",
"8",
"8",
"9",
"9",
"6",
"9",
"7",
"1",
"0",
"6",
"2",
"8",
"8",
"6",
"3",
"5",
"0",
"8",
"0",
"2",
"1",
"4",
"0",
"7",
"6",
"1",
"3",
"6",
"1",
"9",
"3",
"0",
"2",
"8"
] | [
"nonn",
"cons",
"easy"
] | 14 | 0 | 2 | null | null | Stefano Spezia, Dec 07 2024 | 2025-04-03T04:12:15 | oeisdata/seq/A378/A378793.seq | 7d36acd49ba397c35da739d94eee8814 |
A378794 | Numbers k such that tau(k) == 1 (mod(2*(tau(k^2 + k - 1)))), where tau(k) = A000005(k). | [
"1",
"16",
"36",
"100",
"196",
"225",
"256",
"441",
"484",
"625",
"676",
"1089",
"1156",
"1225",
"1296",
"2116",
"2601",
"3136",
"3249",
"3364",
"3844",
"4225",
"5929",
"6561",
"7056",
"7225",
"7569",
"8100",
"8281",
"8836",
"9216",
"10000",
"11236",
"12321",
"13924",
"14161",
"14884",
"15129",
"16641",
"17689",
"17956",
"19881",
"20164",
"20449"
] | [
"nonn",
"easy"
] | 11 | 1 | 2 | [
"A000005",
"A000040",
"A378789",
"A378792",
"A378794"
] | null | Claude H. R. Dequatre, Dec 07 2024 | 2024-12-21T00:45:17 | oeisdata/seq/A378/A378794.seq | bf13a294c298f53e72e5eac41f9274ef |
A378795 | Ulam numbers that are semiprimes. | [
"4",
"6",
"26",
"38",
"57",
"62",
"69",
"77",
"82",
"87",
"106",
"145",
"155",
"177",
"206",
"209",
"219",
"221",
"253",
"309",
"319",
"339",
"341",
"358",
"382",
"451",
"485",
"497",
"502",
"566",
"685",
"695",
"734",
"781",
"849",
"866",
"893",
"905",
"949",
"1018",
"1037",
"1079",
"1081",
"1101",
"1157",
"1167",
"1169",
"1186",
"1191",
"1257",
"1313",
"1355"
] | [
"nonn"
] | 17 | 1 | 1 | [
"A001358",
"A002858",
"A068820",
"A378795"
] | null | Massimo Kofler, Dec 07 2024 | 2025-01-25T03:23:10 | oeisdata/seq/A378/A378795.seq | e7eee790257a3168ed77abce319b1f4e |
A378796 | Number of minimal edge cuts in the n-sun graph. | [
"1",
"6",
"15",
"44",
"125",
"370",
"1099",
"3288",
"9849",
"29534",
"88583",
"265732",
"797173",
"2391498",
"7174467",
"21523376",
"64570097",
"193710262",
"581130751",
"1743392220",
"5230176621",
"15690529826",
"47071589435",
"141214768264",
"423644304745",
"1270932914190",
"3812798742519",
"11438396227508",
"34315188682469",
"102945566047354"
] | [
"nonn",
"easy"
] | 23 | 1 | 2 | [
"A046717",
"A377770",
"A378796"
] | null | Eric W. Weisstein, Dec 07 2024 | 2024-12-19T17:34:33 | oeisdata/seq/A378/A378796.seq | 602467760eb3389e75b1c9d07c531783 |
A378797 | Number of graph minors in the n-web graph. | [
"1019",
"15126",
"319743",
"6225029"
] | [
"nonn",
"more"
] | 4 | 3 | 1 | null | null | Eric W. Weisstein, Dec 07 2024 | 2024-12-07T14:56:51 | oeisdata/seq/A378/A378797.seq | d2ff54e3f5fd412bf4489da59a99700a |
A378798 | Decimal expansion of 16/(207*sqrt(53)). | [
"0",
"1",
"0",
"6",
"1",
"7",
"2",
"4",
"1",
"6",
"5",
"7",
"8",
"6",
"9",
"6",
"8",
"3",
"0",
"1",
"3",
"1",
"7",
"6",
"2",
"6",
"8",
"3",
"3",
"1",
"4",
"5",
"8",
"6",
"2",
"0",
"4",
"2",
"6",
"6",
"1",
"9",
"5",
"1",
"6",
"4",
"4",
"5",
"2",
"8",
"5",
"1",
"7",
"3",
"5",
"4",
"9",
"7",
"2",
"6",
"6",
"3",
"4",
"6",
"4",
"2",
"2",
"8",
"8",
"3",
"8",
"3",
"1",
"7",
"5",
"4",
"6",
"2",
"4",
"4",
"4",
"8",
"9",
"4",
"1",
"0",
"9",
"3",
"1",
"2",
"7",
"8",
"3",
"2",
"7",
"3",
"6",
"1",
"4",
"8",
"0"
] | [
"nonn",
"cons",
"easy"
] | 7 | 0 | 4 | [
"A010506",
"A378798"
] | null | Stefano Spezia, Dec 07 2024 | 2025-04-03T04:12:42 | oeisdata/seq/A378/A378798.seq | 838d8ee001d53699584241090c4c3427 |
A378799 | Decimal expansion of 16/(9*sqrt(184607)). | [
"0",
"0",
"4",
"1",
"3",
"7",
"6",
"4",
"6",
"5",
"6",
"5",
"6",
"8",
"5",
"4",
"4",
"7",
"8",
"8",
"5",
"5",
"2",
"4",
"6",
"1",
"9",
"8",
"2",
"0",
"0",
"2",
"1",
"5",
"8",
"2",
"3",
"3",
"3",
"2",
"4",
"6",
"7",
"4",
"0",
"2",
"6",
"3",
"9",
"4",
"1",
"9",
"7",
"0",
"5",
"2",
"1",
"1",
"7",
"0",
"8",
"1",
"1",
"9",
"8",
"9",
"9",
"2",
"9",
"1",
"1",
"1",
"5",
"9",
"1",
"7",
"7",
"4",
"8",
"3",
"7",
"5",
"7",
"6",
"0",
"5",
"2",
"0",
"5",
"8",
"9",
"1",
"0",
"5",
"2",
"5",
"9",
"9",
"8",
"1",
"6",
"7"
] | [
"nonn",
"cons",
"easy"
] | 7 | 0 | 3 | null | null | Stefano Spezia, Dec 07 2024 | 2025-04-03T04:13:07 | oeisdata/seq/A378/A378799.seq | 4a060c60ee74cd7b46a769d97ac034eb |
A378800 | Decimal expansion of 4*(8 - 4*sqrt(2) - log(2))/(2*sqrt(2) - 1). | [
"3",
"6",
"0",
"9",
"6",
"5",
"6",
"7",
"3",
"1",
"9",
"8",
"8",
"6",
"2",
"9",
"0",
"8",
"1",
"5",
"8",
"5",
"8",
"4",
"5",
"2",
"1",
"2",
"4",
"5",
"0",
"1",
"3",
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"2",
"6",
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"6",
"9",
"8",
"2",
"6",
"5",
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"2",
"1",
"2",
"4",
"6",
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"0",
"8",
"5",
"6",
"2",
"4",
"8",
"7",
"0",
"0",
"8",
"4",
"6",
"5",
"0",
"9",
"8",
"5",
"9",
"8",
"3",
"8",
"7",
"4",
"0",
"7",
"0",
"3",
"5",
"8",
"6",
"2",
"8",
"6",
"6",
"7",
"4",
"7",
"8",
"3",
"1",
"9",
"3",
"1"
] | [
"nonn",
"cons"
] | 5 | 1 | 1 | [
"A002162",
"A002193",
"A010466",
"A010487",
"A378800"
] | null | Stefano Spezia, Dec 07 2024 | 2024-12-08T02:43:20 | oeisdata/seq/A378/A378800.seq | 0b2bc8b9312d4112ed4fd9f32a4c4d73 |
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