sequence_id
stringlengths 7
7
| sequence_name
stringlengths 4
573
| sequence
listlengths 1
348
| keywords
listlengths 1
8
| score
int64 1
2.35k
| offset_a
int64 -14,827
666,262,453B
| offset_b
int64 0
635M
⌀ | cross_references
listlengths 1
128
⌀ | former_ids
listlengths 1
3
⌀ | author
stringlengths 7
231
⌀ | timestamp
timestamp[us]date 1999-12-11 03:00:00
2025-07-19 00:40:46
| filename
stringlengths 29
29
| hash
stringlengths 32
32
|
|---|---|---|---|---|---|---|---|---|---|---|---|---|
A002701
|
Coefficients for numerical differentiation.
|
[
"1",
"1",
"7",
"41",
"479",
"59",
"266681",
"63397",
"514639",
"178939",
"10410343",
"18500393",
"40799043101",
"1411432849",
"6620481151",
"48409924397",
"238357395880861",
"339716530787",
"86364397717734821",
"421950627598601",
"222226462279",
"15392144025383"
] |
[
"nonn",
"frac"
] | 28 | 2 | 3 |
[
"A002455",
"A002701",
"A002702"
] |
[
"M4424",
"N1870"
] |
N. J. A. Sloane
| 2019-02-28T11:45:06 |
oeisdata/seq/A002/A002701.seq
|
6d94216c1f86f482aee2343f9e4afdad
|
A002702
|
Coefficients for numerical differentiation.
|
[
"1",
"4",
"120",
"3024",
"151200",
"79200",
"1513512000",
"1513512000",
"51459408000",
"74662922880",
"18068427336960",
"133196739984000",
"1215553449093984000",
"173650492727712000",
"3357242859402432000",
"101013513093196704000",
"2043503369875369321920000"
] |
[
"nonn",
"frac"
] | 27 | 2 | 2 |
[
"A002455",
"A002701",
"A002702"
] |
[
"M3709",
"N1515"
] |
N. J. A. Sloane
| 2019-02-28T09:44:02 |
oeisdata/seq/A002/A002702.seq
|
545015c63fdb09ed387f11edd5aa95fe
|
A002703
|
Sets with a congruence property.
|
[
"0",
"0",
"0",
"2",
"6",
"14",
"24",
"46",
"88",
"162",
"300",
"562",
"1056",
"1982",
"3742",
"7082",
"13438",
"25574",
"48768",
"93198",
"178480",
"342392",
"657918",
"1266202",
"2440318",
"4709374",
"9099504",
"17602322",
"34087010",
"66076414",
"128207976",
"248983550",
"483939976",
"941362694",
"1832519262",
"3569842946",
"6958934352"
] |
[
"nonn"
] | 63 | 3 | 4 |
[
"A002703",
"A002704",
"A002705",
"A053632",
"A178666",
"A262567",
"A262568",
"A262569"
] |
[
"M1598",
"N0624"
] |
N. J. A. Sloane
| 2023-10-20T12:34:26 |
oeisdata/seq/A002/A002703.seq
|
13a748da4c1a22aebc6105e87844a865
|
A002704
|
Number of sets with a congruence property.
|
[
"2",
"26",
"938",
"42800",
"2130458",
"111557594",
"6041272682",
"335089258634",
"18922687509962",
"1083572842675610",
"62744027461625648",
"3666433604712457466",
"215879610645469496234",
"12792865816027823374874",
"762278349313657804740842",
"45638342462133835019322554"
] |
[
"nonn"
] | 47 | 0 | 1 |
[
"A002703",
"A002704",
"A002705",
"A262570",
"A262583",
"A262584"
] |
[
"M2146",
"N0855"
] |
N. J. A. Sloane
| 2023-10-19T08:48:54 |
oeisdata/seq/A002/A002704.seq
|
7079bb7ca15e391aab6358fc759e1a73
|
A002705
|
Sets with a congruence property.
|
[
"0",
"4",
"40",
"468",
"5828",
"76260",
"1032444",
"14316584",
"202116108",
"2893451652",
"41886157564",
"611902123284",
"9007199254740",
"133439988963012",
"1987795697598012",
"29752813022112180",
"447193795726343004",
"6746237832670921768",
"102105221251235572188"
] |
[
"nonn"
] | 40 | 0 | 2 |
[
"A002703",
"A002704",
"A002705",
"A262585",
"A262590"
] |
[
"M3673",
"N1497"
] |
N. J. A. Sloane
| 2023-10-20T12:34:04 |
oeisdata/seq/A002/A002705.seq
|
6e1a69cd43c581fe2864b519a97e0f5b
|
A002706
|
Theta series of 6-dimensional lattice A_6^(2) (other names for this lattice or the corresponding quadratic form are LAMBDA_{3,lambda}, P_6^(5), phi_6, F_14).
|
[
"1",
"0",
"42",
"56",
"84",
"168",
"280",
"336",
"462",
"336",
"840",
"672",
"1176",
"1176",
"1386",
"1008",
"1848",
"2016",
"2058",
"2520",
"3528",
"2408",
"3108",
"2688",
"4760",
"3024",
"5880",
"4592",
"6468",
"4704",
"5040",
"6720",
"6930",
"6832",
"10080",
"7224",
"7812",
"7392",
"12600",
"7056",
"14280",
"11760",
"12040",
"9408"
] |
[
"nonn"
] | 33 | 0 | 3 |
[
"A002653",
"A002656",
"A002706"
] | null |
N. J. A. Sloane
| 2022-09-08T08:44:31 |
oeisdata/seq/A002/A002706.seq
|
308d7e7e59ccbd6726440077a7381615
|
A002707
|
Number of ternary trees with n nodes.
|
[
"1",
"1",
"3",
"31",
"8401",
"100130704103",
"167321084032306100365838018661441",
"780729803567659232170209385771412393899822868427528396719062233553621064241305757906662806984051"
] |
[
"nonn",
"nice",
"easy"
] | 28 | 0 | 3 | null |
[
"M3128",
"N1268"
] |
N. J. A. Sloane
| 2025-07-02T16:01:54 |
oeisdata/seq/A002/A002707.seq
|
75dac6a7884d1764d221b5e12a10b2f8
|
A002708
|
a(n) = Fibonacci(n) mod n.
|
[
"0",
"1",
"2",
"3",
"0",
"2",
"6",
"5",
"7",
"5",
"1",
"0",
"12",
"13",
"10",
"11",
"16",
"10",
"1",
"5",
"5",
"1",
"22",
"0",
"0",
"25",
"20",
"11",
"1",
"20",
"1",
"5",
"13",
"33",
"30",
"0",
"36",
"1",
"37",
"35",
"1",
"34",
"42",
"25",
"20",
"45",
"46",
"0",
"36",
"25",
"32",
"23",
"52",
"8",
"5",
"21",
"40",
"1",
"1",
"0",
"1",
"1",
"43",
"59",
"60",
"52",
"66",
"65",
"44",
"15",
"1",
"0",
"72",
"73",
"50",
"3",
"2",
"44",
"1",
"5",
"7",
"1",
"82",
"24"
] |
[
"nonn",
"easy",
"look"
] | 52 | 1 | 3 |
[
"A002708",
"A002726",
"A002752",
"A023172",
"A023173",
"A023174",
"A023182",
"A161553",
"A263101"
] | null |
John C. Hallyburton, Jr. (hallyb(AT)evms.ENET.dec.com)
| 2023-10-27T19:25:09 |
oeisdata/seq/A002/A002708.seq
|
9a2bd8b8fd7984e8b2ff8d19b8fc3786
|
A002709
|
Triangulations of the disk G_{n,0}.
|
[
"1",
"1",
"1",
"5",
"24",
"133",
"846",
"5661",
"39556",
"286000",
"2123329",
"16112057",
"124512556",
"977227830",
"7772368380",
"62535450861",
"508271324688",
"4168218286276",
"34455941596060",
"286864341314320",
"2403705165816240",
"20258850167232165",
"171652324167433710",
"1461462393790971585",
"12498416291503945764"
] |
[
"nonn"
] | 36 | 0 | 4 |
[
"A002709",
"A262586"
] |
[
"M3933",
"N1618"
] |
N. J. A. Sloane
| 2024-11-23T14:27:56 |
oeisdata/seq/A002/A002709.seq
|
e7b6d63d34e4005631c58b5439e4cc1c
|
A002710
|
Triangulations of the disk G_{n,1}.
|
[
"1",
"2",
"6",
"26",
"147",
"892",
"5876",
"40490",
"290020",
"2136488",
"16113254",
"123878966",
"968017330",
"7670113856",
"61510346760",
"498496979754",
"4077605379276",
"33629943832280",
"279413323740280",
"2336935584712872",
"19663001667901339",
"166348460274745684",
"1414318445894183076",
"12079654921382780966"
] |
[
"nonn"
] | 24 | 0 | 2 |
[
"A002710",
"A262586"
] |
[
"M1680",
"N0662"
] |
N. J. A. Sloane
| 2024-11-23T14:27:52 |
oeisdata/seq/A002/A002710.seq
|
1c1972710cb9c69d6ac1866ce6782428
|
A002711
|
Triangulations of the disk G_{n,2}.
|
[
"1",
"5",
"21",
"119",
"735",
"4830",
"33253",
"237336",
"1743588",
"13114465",
"100591491",
"784428522",
"6204258970",
"49675571820",
"402013608525",
"3284214703056",
"27055525967324",
"224557688302164",
"1876374953765620",
"15774315150669075",
"133345566025874055",
"1132905339504465590",
"9669675838370401035"
] |
[
"nonn"
] | 31 | 0 | 2 |
[
"A002711",
"A210696",
"A262586"
] |
[
"M3916",
"N1609"
] |
N. J. A. Sloane
| 2025-01-17T10:47:00 |
oeisdata/seq/A002/A002711.seq
|
36f6a106fa78227e86718f4083ac0d17
|
A002712
|
Number of unrooted triangulations of a disk that have reflection symmetry with n interior nodes and 3 nodes on the boundary.
|
[
"1",
"1",
"1",
"3",
"8",
"23",
"68",
"215",
"680",
"2226",
"7327",
"24607",
"83060",
"284046",
"975950",
"3383343",
"11778308",
"41269252",
"145131502",
"512881550",
"1818259952",
"6470758289",
"23091680690",
"82659905947",
"296605398856",
"1067012168350",
"3846553544904",
"13896522968160",
"50296815014780",
"182378110257354",
"662384549806938"
] |
[
"nonn"
] | 34 | 0 | 4 |
[
"A002712",
"A169809"
] |
[
"M2746",
"N1103"
] |
N. J. A. Sloane
| 2023-04-25T07:57:59 |
oeisdata/seq/A002/A002712.seq
|
4ddb305f0e8a3502d2de9a091945cc6e
|
A002713
|
Number of unrooted triangulations of the disk with n interior nodes and 3 nodes on the boundary.
|
[
"1",
"1",
"1",
"4",
"16",
"78",
"457",
"2938",
"20118",
"144113",
"1065328",
"8068332",
"62297808",
"488755938",
"3886672165",
"31269417102",
"254141551498",
"2084129777764",
"17228043363781",
"143432427097935",
"1201853492038096",
"10129428318995227",
"85826173629557200"
] |
[
"nonn"
] | 25 | 0 | 4 |
[
"A002713",
"A169808"
] |
[
"M3524",
"N1431"
] |
N. J. A. Sloane
| 2021-02-25T02:39:21 |
oeisdata/seq/A002/A002713.seq
|
60792cba413f857d92d88b4eb393d563
|
A002714
|
Number of different keys with n cuts, depths between 1 and 7 and depth difference at most 1 between adjacent cut depths.
|
[
"1",
"7",
"19",
"53",
"149",
"421",
"1193",
"3387",
"9627",
"27383",
"77923",
"221805",
"631469",
"1797957",
"5119593",
"14578387",
"41514003",
"118218823",
"336653331",
"958698053",
"2730124261",
"7774706437",
"22140438345",
"63050541515",
"179552587883",
"511322221559",
"1456121982755",
"4146683677885"
] |
[
"nonn"
] | 49 | 0 | 2 | null |
[
"M4366",
"N1832"
] |
N. J. A. Sloane
| 2025-04-02T09:38:13 |
oeisdata/seq/A002/A002714.seq
|
6a709a7fd7ac9e7b087fc881c02e468f
|
A002715
|
An infinite coprime sequence defined by recursion.
|
[
"3",
"7",
"23",
"47",
"1103",
"2207",
"2435423",
"4870847",
"11862575248703",
"23725150497407",
"281441383062305809756861823",
"562882766124611619513723647",
"158418504200047111075388369241884118003210485743490303"
] |
[
"nonn"
] | 35 | 0 | 1 |
[
"A001685",
"A002715",
"A003686",
"A064526"
] |
[
"M2683",
"N1073"
] |
N. J. A. Sloane
| 2021-12-19T10:00:58 |
oeisdata/seq/A002/A002715.seq
|
02dedf2b36f2cba7513d547191a47142
|
A002716
|
An infinite coprime sequence defined by recursion.
|
[
"3",
"5",
"13",
"17",
"241",
"257",
"65281",
"65537",
"4294901761",
"4294967297",
"18446744069414584321",
"18446744073709551617",
"340282366920938463444927863358058659841"
] |
[
"nonn"
] | 36 | 0 | 1 |
[
"A000215",
"A001685",
"A002715",
"A002716",
"A003686",
"A064526",
"A220294"
] |
[
"M2488",
"N0986"
] |
N. J. A. Sloane
| 2023-10-20T09:23:04 |
oeisdata/seq/A002/A002716.seq
|
16ce1b0c365999411873fc9f21a1b663
|
A002717
|
a(n) = floor(n(n+2)(2n+1)/8).
|
[
"0",
"1",
"5",
"13",
"27",
"48",
"78",
"118",
"170",
"235",
"315",
"411",
"525",
"658",
"812",
"988",
"1188",
"1413",
"1665",
"1945",
"2255",
"2596",
"2970",
"3378",
"3822",
"4303",
"4823",
"5383",
"5985",
"6630",
"7320",
"8056",
"8840",
"9673",
"10557",
"11493",
"12483",
"13528",
"14630",
"15790",
"17010",
"18291",
"19635",
"21043",
"22517",
"24058"
] |
[
"nonn",
"easy",
"nice"
] | 122 | 0 | 3 |
[
"A000004",
"A000012",
"A000034",
"A000217",
"A000292",
"A002623",
"A002717",
"A006578",
"A016777",
"A032766",
"A045947",
"A070893",
"A085691",
"A135712",
"A135713",
"A220053"
] |
[
"M3827",
"N1569"
] |
N. J. A. Sloane
| 2025-02-16T08:32:26 |
oeisdata/seq/A002/A002717.seq
|
a28652d45985a7e6b31a467a9ba4b6de
|
A002718
|
Number of bicoverings of an n-set.
|
[
"1",
"0",
"1",
"8",
"80",
"1088",
"19232",
"424400",
"11361786",
"361058000",
"13386003873",
"570886397340",
"27681861184474",
"1511143062540976",
"92091641176725504",
"6219762391554815200",
"462595509951068027741",
"37676170944802047077248",
"3343539821715571537772071",
"321874499078487207168905840"
] |
[
"nonn",
"nice"
] | 55 | 0 | 4 |
[
"A002718",
"A002719",
"A003462",
"A020554",
"A059443",
"A059945",
"A059951",
"A060053"
] |
[
"M4559",
"N1941"
] |
N. J. A. Sloane
| 2025-04-18T05:44:00 |
oeisdata/seq/A002/A002718.seq
|
421cee544e76104bb7b44ce94eb26326
|
A002719
|
Erroneous version of A020554.
|
[
"1",
"3",
"16",
"139",
"1750",
"29388",
"623909"
] |
[
"dead"
] | 16 | 1 | 2 | null |
[
"M3029",
"N1228"
] |
N. J. A. Sloane, Oct 20 2015
| 2025-04-18T05:46:09 |
oeisdata/seq/A002/A002719.seq
|
56a92f390f35cde2298886442980ff86
|
A002720
|
Number of partial permutations of an n-set; number of n X n binary matrices with at most one 1 in each row and column.
|
[
"1",
"2",
"7",
"34",
"209",
"1546",
"13327",
"130922",
"1441729",
"17572114",
"234662231",
"3405357682",
"53334454417",
"896324308634",
"16083557845279",
"306827170866106",
"6199668952527617",
"132240988644215842",
"2968971263911288999",
"69974827707903049154",
"1727194482044146637521",
"44552237162692939114282"
] |
[
"nonn",
"easy",
"nice"
] | 348 | 0 | 2 |
[
"A000110",
"A000262",
"A000712",
"A001048",
"A002720",
"A002793",
"A020556",
"A069223",
"A073003",
"A088699",
"A090210",
"A144084",
"A160617",
"A160618",
"A283500",
"A289192",
"A364673"
] |
[
"M1795",
"N0708"
] |
N. J. A. Sloane
| 2025-05-04T04:17:10 |
oeisdata/seq/A002/A002720.seq
|
6c5b3cbe83ee654b7f0f98eb1601f034
|
A002721
|
Number of 3 X 3 X 3 arrays M_ijk (1 <= i,j,k <= 3) with entries satisfying 0 <= M_ijk <= n and all line sums equal to n.
|
[
"1",
"12",
"132",
"847",
"3921",
"14506",
"45402",
"124707",
"308407",
"699766",
"1477686",
"2936517",
"5540107",
"9993192",
"17333536",
"29048541",
"47220357",
"74703832",
"115341952",
"174223731",
"257989821",
"375191422",
"536708382",
"756232687",
"1050823851",
"1441543026",
"1954172962"
] |
[
"nonn",
"easy"
] | 68 | 0 | 2 |
[
"A001496",
"A002721",
"A002817"
] |
[
"M4864",
"N2080"
] |
N. J. A. Sloane
| 2023-10-20T12:33:20 |
oeisdata/seq/A002/A002721.seq
|
17c1fa505ad6f08bbd33c2dc2bce808a
|
A002722
|
Rotatable partitions.
|
[
"1",
"1",
"1",
"2",
"2",
"2",
"4",
"6",
"6",
"8",
"11",
"13",
"17",
"24",
"28",
"36",
"47",
"56",
"69",
"94",
"114",
"138",
"177",
"218",
"262",
"333",
"410",
"496",
"615",
"755",
"906",
"1120",
"1372",
"1648",
"2006",
"2455",
"2939",
"3557"
] |
[
"nonn",
"more"
] | 25 | 1 | 4 | null |
[
"M0238",
"N0081"
] |
N. J. A. Sloane
| 2021-07-11T18:42:37 |
oeisdata/seq/A002/A002722.seq
|
8abbfd9c1096ec597e744d2c4ce8e155
|
A002723
|
Number of rotatable partitions of [n].
|
[
"1",
"1",
"1",
"1",
"2",
"2",
"3",
"3",
"5",
"6",
"8",
"9",
"11",
"14",
"19",
"22",
"28",
"34",
"44",
"52",
"63",
"78",
"99",
"119",
"144",
"178",
"219",
"265"
] |
[
"nonn",
"more"
] | 28 | 1 | 5 |
[
"A002722",
"A002723"
] |
[
"M0272",
"N0095"
] |
N. J. A. Sloane
| 2023-10-22T16:31:34 |
oeisdata/seq/A002/A002723.seq
|
36e23cc99faeb1c2284cc91f2914a19c
|
A002724
|
Number of inequivalent n X n binary matrices, where equivalence means permutations of rows or columns.
|
[
"1",
"2",
"7",
"36",
"317",
"5624",
"251610",
"33642660",
"14685630688",
"21467043671008",
"105735224248507784",
"1764356230257807614296",
"100455994644460412263071692",
"19674097197480928600253198363072",
"13363679231028322645152300040033513414",
"31735555932041230032311939400670284689732948"
] |
[
"nonn",
"nice"
] | 106 | 0 | 2 |
[
"A000595",
"A002623",
"A002724",
"A002725",
"A002727",
"A002728",
"A006148",
"A028657",
"A052269",
"A052271",
"A052272",
"A091059",
"A246106",
"A363845",
"A363846"
] |
[
"M1801",
"N0711"
] |
N. J. A. Sloane
| 2023-12-22T02:55:17 |
oeisdata/seq/A002/A002724.seq
|
fbad66e68f47cf90779a2993592d1c0b
|
A002725
|
Number of incidence matrices: n X (n+1) binary matrices under row and column permutations.
|
[
"1",
"3",
"13",
"87",
"1053",
"28576",
"2141733",
"508147108",
"402135275365",
"1073376057490373",
"9700385489355970183",
"298434346895322960005291",
"31479360095907908092817694945",
"11474377948948020660089085281068730",
"14568098446466140788730090352230460100956"
] |
[
"nonn",
"nice"
] | 41 | 0 | 2 |
[
"A002623",
"A002724",
"A002725",
"A002727",
"A002728",
"A006148",
"A028657"
] |
[
"M2957",
"N1195"
] |
N. J. A. Sloane
| 2023-03-01T11:24:34 |
oeisdata/seq/A002/A002725.seq
|
e1c57adb7b226d74d9dca4e67a298cb2
|
A002726
|
a(n) = Fibonacci(n+1) mod n.
|
[
"0",
"0",
"0",
"1",
"3",
"1",
"0",
"2",
"1",
"9",
"1",
"5",
"0",
"8",
"12",
"13",
"0",
"5",
"1",
"6",
"8",
"13",
"0",
"1",
"18",
"14",
"21",
"9",
"1",
"19",
"1",
"2",
"25",
"1",
"17",
"17",
"0",
"2",
"27",
"21",
"1",
"5",
"0",
"38",
"8",
"1",
"0",
"1",
"8",
"24",
"18",
"41",
"0",
"31",
"52",
"34",
"22",
"31",
"1",
"41",
"1",
"2",
"42",
"29",
"3",
"35",
"0",
"2",
"47",
"69",
"1",
"1",
"0",
"38",
"57",
"5",
"76",
"31",
"1",
"66",
"55",
"43",
"0",
"5",
"3",
"44"
] |
[
"nonn"
] | 17 | 1 | 5 |
[
"A000045",
"A002708",
"A002726"
] | null |
John C. Hallyburton, Jr. (hallyb(AT)evms.ENET.dec.com)
| 2018-11-07T21:50:57 |
oeisdata/seq/A002/A002726.seq
|
87dc52e9bb5818acd4f0dacd62f5b127
|
A002727
|
Number of 3 X n binary matrices up to row and column permutations.
|
[
"1",
"4",
"13",
"36",
"87",
"190",
"386",
"734",
"1324",
"2284",
"3790",
"6080",
"9473",
"14378",
"21323",
"30974",
"44159",
"61898",
"85440",
"116286",
"156240",
"207446",
"272432",
"354162",
"456097",
"582238",
"737205",
"926298",
"1155567",
"1431892",
"1763074",
"2157904",
"2626276",
"3179278",
"3829294",
"4590118",
"5477081"
] |
[
"nonn",
"nice",
"easy"
] | 100 | 0 | 2 |
[
"A000601",
"A002623",
"A002727",
"A006148",
"A006381",
"A028657"
] |
[
"M3460",
"N1407"
] |
N. J. A. Sloane
| 2025-03-07T12:04:18 |
oeisdata/seq/A002/A002727.seq
|
7ced58e749878d77dcf8cf2aed2f0c8a
|
A002728
|
Number of n X (n+2) binary matrices.
|
[
"1",
"4",
"22",
"190",
"3250",
"136758",
"17256831",
"7216495370",
"10271202313659",
"49856692830176512",
"826297617412284162618",
"46948445432190686211183650",
"9200267975562856184153936960940",
"6261904454889790650636380541051266410",
"14910331834338546882501064075429145637985605"
] |
[
"nonn"
] | 39 | 0 | 2 |
[
"A002623",
"A002724",
"A002725",
"A002727",
"A002728",
"A006148",
"A028657"
] |
[
"M3593",
"N1457"
] |
N. J. A. Sloane
| 2023-03-01T11:23:56 |
oeisdata/seq/A002/A002728.seq
|
c94ca835346a8a2d0000207c3c7c6dcc
|
A002729
|
Number of equivalence classes of binary sequences of period n.
|
[
"1",
"2",
"3",
"4",
"6",
"6",
"13",
"10",
"24",
"22",
"45",
"30",
"158",
"74",
"245",
"368",
"693",
"522",
"2637",
"1610",
"7386",
"8868",
"19401",
"16770",
"94484",
"67562",
"216275",
"277534",
"815558",
"662370",
"4500267",
"2311470",
"8466189",
"13045108",
"31593285",
"40937606",
"159772176",
"103197490",
"401913697"
] |
[
"nonn",
"easy",
"nice"
] | 62 | 0 | 2 |
[
"A002729",
"A002730",
"A285548"
] |
[
"M0538",
"N0191"
] |
N. J. A. Sloane
| 2023-09-02T15:45:57 |
oeisdata/seq/A002/A002729.seq
|
283338c3498d4e93869e358284047230
|
A002730
|
Number of equivalence classes of binary sequences of primitive period n.
|
[
"2",
"1",
"2",
"3",
"4",
"8",
"8",
"18",
"18",
"38",
"28",
"142",
"72",
"234",
"360",
"669",
"520",
"2606",
"1608",
"7338",
"8856",
"19370",
"16768",
"94308",
"67556",
"216200",
"277512",
"815310",
"662368",
"4499852",
"2311468",
"8465496",
"13045076",
"31592762",
"40937592",
"159769394",
"103197488",
"401912086"
] |
[
"nonn",
"easy",
"nice"
] | 27 | 1 | 1 |
[
"A002729",
"A002730"
] |
[
"M0114",
"N0044"
] |
N. J. A. Sloane
| 2022-01-29T01:02:47 |
oeisdata/seq/A002/A002730.seq
|
151eec078c17f75726af6c6833c021b5
|
A002731
|
Numbers k such that (k^2 + 1)/2 is prime.
|
[
"3",
"5",
"9",
"11",
"15",
"19",
"25",
"29",
"35",
"39",
"45",
"49",
"51",
"59",
"61",
"65",
"69",
"71",
"79",
"85",
"95",
"101",
"121",
"131",
"139",
"141",
"145",
"159",
"165",
"169",
"171",
"175",
"181",
"195",
"199",
"201",
"205",
"209",
"219",
"221",
"231",
"245",
"261",
"271",
"275",
"279",
"289",
"299",
"309",
"315",
"321",
"325",
"329",
"335",
"345",
"349",
"371",
"375",
"379",
"391",
"399",
"405"
] |
[
"nonn",
"easy",
"nice"
] | 61 | 1 | 1 |
[
"A000982",
"A002731",
"A010051",
"A027861",
"A027862",
"A091277",
"A116945",
"A129307",
"A187431",
"A188546",
"A188547"
] |
[
"M2444",
"N0971"
] |
N. J. A. Sloane
| 2024-08-01T03:42:29 |
oeisdata/seq/A002/A002731.seq
|
56503931a6437633e53ef609b51e2895
|
A002732
|
Numbers k such that (4*k^2 + 1)/5 is prime.
|
[
"4",
"6",
"11",
"14",
"21",
"24",
"26",
"29",
"31",
"39",
"44",
"46",
"51",
"54",
"76",
"79",
"89",
"94",
"99",
"101",
"111",
"119",
"124",
"129",
"131",
"136",
"146",
"149",
"154",
"156",
"164",
"176",
"179",
"181",
"194",
"201",
"211",
"214",
"229",
"231",
"239",
"244",
"246",
"254",
"261",
"279",
"286",
"294",
"301",
"311",
"314",
"319",
"326",
"331",
"346",
"349"
] |
[
"nonn",
"easy"
] | 25 | 1 | 1 | null |
[
"M3281",
"N1324"
] |
N. J. A. Sloane
| 2023-10-20T09:46:15 |
oeisdata/seq/A002/A002732.seq
|
0b7f2fc18a338c99fdecad8bcbc5a38d
|
A002733
|
Numbers k such that (k^2 + 1)/10 is prime.
|
[
"7",
"13",
"17",
"23",
"27",
"33",
"37",
"53",
"63",
"67",
"77",
"87",
"97",
"103",
"113",
"127",
"137",
"147",
"153",
"163",
"167",
"197",
"223",
"227",
"247",
"263",
"267",
"277",
"283",
"287",
"297",
"303",
"323",
"347",
"363",
"367",
"373",
"383",
"397"
] |
[
"nonn"
] | 36 | 1 | 1 |
[
"A000196",
"A002522",
"A002731",
"A002732",
"A002733",
"A010051"
] |
[
"M4342",
"N1047"
] |
N. J. A. Sloane
| 2022-02-28T12:09:31 |
oeisdata/seq/A002/A002733.seq
|
f050d4bb2d1ef4d07fcb4c6921b8cccd
|
A002734
|
Remove squares!
|
[
"2",
"3",
"5",
"6",
"7",
"2",
"10",
"11",
"3",
"13",
"14",
"15",
"17",
"2",
"19",
"5",
"21",
"22",
"23",
"6",
"26",
"3",
"7",
"29",
"30",
"31",
"2",
"33",
"34",
"35",
"37",
"38",
"39",
"10",
"41",
"42",
"43",
"11",
"5",
"46",
"47",
"3",
"2",
"51",
"13",
"53",
"6",
"55",
"14",
"57",
"58",
"59",
"15",
"61",
"62",
"7",
"65",
"66",
"67",
"17",
"69",
"70",
"71",
"2",
"73",
"74",
"3",
"19",
"77",
"78",
"79"
] |
[
"nonn"
] | 29 | 1 | 1 |
[
"A000037",
"A002734",
"A007913"
] |
[
"M0611",
"N0222"
] |
N. J. A. Sloane
| 2025-06-09T00:35:04 |
oeisdata/seq/A002/A002734.seq
|
2d0b65430df4c0a86fc3a24e8eb31762
|
A002735
|
Related to Euler numbers, expansion of e.g.f. sec(x)*tan^2(x).
|
[
"4",
"14",
"56",
"331",
"1324",
"12284",
"49136",
"663061",
"2652244",
"49164554",
"196658216",
"4798037791",
"19192151164",
"596372040824",
"2385488163296",
"91991577140521",
"367966308562084",
"17244625801225094",
"68978503204900376",
"3861296322290987251"
] |
[
"nonn"
] | 31 | 1 | 1 |
[
"A000364",
"A002735",
"A259688"
] |
[
"M3486",
"N1417"
] |
N. J. A. Sloane
| 2025-02-03T07:21:23 |
oeisdata/seq/A002/A002735.seq
|
a23c2eb57a317191d7073b23df667459
|
A002736
|
Apéry numbers: a(n) = n^2*C(2n,n).
|
[
"0",
"2",
"24",
"180",
"1120",
"6300",
"33264",
"168168",
"823680",
"3938220",
"18475600",
"85357272",
"389398464",
"1757701400",
"7862853600",
"34901442000",
"153876579840",
"674412197580",
"2940343837200",
"12759640231800",
"55138611528000",
"237371722628040",
"1018383898440480"
] |
[
"nonn",
"easy",
"nice"
] | 126 | 0 | 2 |
[
"A000108",
"A002736",
"A005258",
"A005259",
"A005429",
"A005430",
"A086467",
"A331431"
] |
[
"M2136",
"N0848"
] |
N. J. A. Sloane
| 2025-01-05T19:51:32 |
oeisdata/seq/A002/A002736.seq
|
2ecfd3dce63f408a86833f486b7ccd61
|
A002737
|
a(n) = Sum_{j=0..n} (n+j)*binomial(n+j,j).
|
[
"0",
"5",
"35",
"189",
"924",
"4290",
"19305",
"85085",
"369512",
"1587222",
"6760390",
"28601650",
"120349800",
"504131940",
"2103781365",
"8751023325",
"36300541200",
"150217371150",
"620309379690",
"2556724903590",
"10520494818600",
"43225511319900",
"177361820257050",
"726860987017074",
"2975511197688624",
"12168371410300700"
] |
[
"nonn"
] | 47 | 0 | 2 |
[
"A000108",
"A002737",
"A331432"
] |
[
"M3975",
"N1644"
] |
N. J. A. Sloane
| 2024-03-20T15:40:24 |
oeisdata/seq/A002/A002737.seq
|
f0a6c1ebb84974ee42030362b744d12c
|
A002738
|
Coefficients for extrapolation.
|
[
"3",
"60",
"630",
"5040",
"34650",
"216216",
"1261260",
"7001280",
"37413090",
"193993800",
"981608628",
"4867480800",
"23728968900",
"114011377200",
"540972351000",
"2538963567360",
"11802213457650",
"54396360988200",
"248812984520100",
"1130341536324000",
"5103492036502860",
"22913637714910800"
] |
[
"nonn"
] | 43 | 0 | 1 |
[
"A002738",
"A002802",
"A007744",
"A020918",
"A331431"
] |
[
"M3165",
"N1283"
] |
N. J. A. Sloane
| 2022-10-18T19:14:32 |
oeisdata/seq/A002/A002738.seq
|
984ec4e3d4fa7829125c41a799fcc80f
|
A002739
|
a(n) = ((2*n-1)!/(2*n!*(n-2)!))*((n^3-3*n^2+2*n+2)/(n^2-1)).
|
[
"1",
"10",
"91",
"651",
"4026",
"22737",
"120835",
"615043",
"3031678",
"14578928",
"68747966",
"319075550",
"1461581460",
"6621579135",
"29718121635",
"132302508195",
"584868588150",
"2569600678260",
"11227927978410",
"48822435838410",
"211370463290220",
"911509393468050",
"3916793943349326",
"16776146058210126",
"71641860657928876"
] |
[
"nonn"
] | 37 | 2 | 2 |
[
"A002739",
"A331432"
] |
[
"M4732",
"N2024"
] |
N. J. A. Sloane
| 2022-10-18T19:15:18 |
oeisdata/seq/A002/A002739.seq
|
687a91378c5c7f588d726e7c49d3aeb9
|
A002740
|
Number of tree-rooted bridgeless planar maps with two vertices and n faces.
|
[
"0",
"0",
"0",
"2",
"15",
"84",
"420",
"1980",
"9009",
"40040",
"175032",
"755820",
"3233230",
"13728792",
"57946200",
"243374040",
"1017958725",
"4242920400",
"17631691440",
"73078721100",
"302202005490",
"1247182879800",
"5137916074200",
"21132472200840",
"86794082253450",
"356013544661424",
"1458583920435600",
"5969389748449400"
] |
[
"nonn",
"easy"
] | 92 | 0 | 4 |
[
"A002740",
"A129175",
"A253180"
] |
[
"M2078",
"N0821"
] |
N. J. A. Sloane
| 2023-02-12T07:19:31 |
oeisdata/seq/A002/A002740.seq
|
e1354c892b7f31eacaee2517cccec150
|
A002741
|
Logarithmic numbers: expansion of the e.g.f. -log(1-x) * e^(-x).
|
[
"0",
"1",
"-1",
"2",
"0",
"9",
"35",
"230",
"1624",
"13209",
"120287",
"1214674",
"13469896",
"162744945",
"2128047987",
"29943053062",
"451123462672",
"7245940789073",
"123604151490591",
"2231697509543362",
"42519034050101744",
"852495597142800377",
"17942811657908144163",
"395553947953212635718",
"9114871523102565301544",
"219135339782236105192745"
] |
[
"sign",
"easy",
"nice"
] | 60 | 0 | 4 |
[
"A000142",
"A000166",
"A000757",
"A002741"
] |
[
"M0037",
"N0010"
] |
N. J. A. Sloane
| 2022-11-28T18:51:04 |
oeisdata/seq/A002/A002741.seq
|
84d14305dfafd6a8c4265f99a6dcec56
|
A002742
|
Logarithmic numbers.
|
[
"2",
"-6",
"24",
"-80",
"450",
"-2142",
"17696",
"-112464",
"1232370",
"-9761510",
"132951192",
"-1258797696",
"20476388114",
"-225380451870",
"4261074439680",
"-53438049741152",
"1151146814425506",
"-16199301256675974",
"391615698778725080",
"-6109914386833902960"
] |
[
"sign"
] | 51 | 1 | 1 |
[
"A002741",
"A002742"
] |
[
"M1672",
"N0658"
] |
N. J. A. Sloane
| 2022-09-26T20:33:04 |
oeisdata/seq/A002/A002742.seq
|
b993c26f7ec187daf8e560e3f1da0e12
|
A002743
|
Sum of logarithmic numbers.
|
[
"1",
"1",
"2",
"24",
"-11",
"1085",
"-2542",
"64344",
"-56415",
"4275137",
"-10660486",
"945005248",
"-6010194555",
"147121931021",
"88135620922",
"23131070531152",
"-120142133444319",
"12007306976370081",
"-103897545509370542",
"4923827766711915784",
"-19471338470911446283",
"1203786171449486366205"
] |
[
"sign"
] | 34 | 1 | 3 |
[
"A000203",
"A002743",
"A002745"
] |
[
"M2132",
"N0845"
] |
N. J. A. Sloane
| 2023-10-20T09:36:27 |
oeisdata/seq/A002/A002743.seq
|
5abdd7c8b5808911f5d4fa0df85b51b1
|
A002744
|
Sum of logarithmic numbers.
|
[
"1",
"0",
"1",
"10",
"-17",
"406",
"-1437",
"20476",
"-44907",
"1068404",
"-5112483",
"230851094",
"-1942311373",
"31916614874",
"-27260241361",
"3826126294680",
"-37957167335671",
"2169009251237640",
"-25847377785179111",
"858747698098918338",
"-5611513985867158697",
"154094365406716365118"
] |
[
"sign"
] | 35 | 1 | 4 |
[
"A000005",
"A002744",
"A002746",
"A318249"
] |
[
"M4682",
"N2001"
] |
N. J. A. Sloane
| 2020-05-13T07:03:37 |
oeisdata/seq/A002/A002744.seq
|
f0ad94dd2922477045d586e1eac822fc
|
A002745
|
Sum of logarithmic numbers.
|
[
"1",
"5",
"20",
"96",
"469",
"3145",
"20684",
"173544",
"1557105",
"16215253",
"159346604",
"2230085528",
"26985045333",
"368730610729",
"5628888393652",
"97987283458928",
"1475486672174337",
"29097611462122437",
"505383110562327268",
"10970329921706735216"
] |
[
"nonn"
] | 38 | 1 | 2 |
[
"A000203",
"A002743",
"A002745"
] |
[
"M3909",
"N1604"
] |
N. J. A. Sloane
| 2023-10-20T09:37:23 |
oeisdata/seq/A002/A002745.seq
|
4494481abf7d64f47af3b6cdd67ef2df
|
A002746
|
Sum of logarithmic numbers.
|
[
"1",
"4",
"13",
"50",
"203",
"1154",
"6627",
"49356",
"403293",
"3858376",
"33929377",
"460614670",
"5168544119",
"64518640406",
"946910125319",
"16124114481720",
"221243980745433",
"4261440137319852",
"68524390012831189",
"1477309421907315082"
] |
[
"nonn"
] | 36 | 1 | 2 |
[
"A000005",
"A002744",
"A002746",
"A318249"
] |
[
"M3468",
"N1411"
] |
N. J. A. Sloane
| 2023-10-20T09:38:10 |
oeisdata/seq/A002/A002746.seq
|
0a1e1acf7905fa5e7c99c2b82a79ecb8
|
A002747
|
Logarithmic numbers.
|
[
"1",
"-2",
"9",
"-28",
"185",
"-846",
"7777",
"-47384",
"559953",
"-4264570",
"61594841",
"-562923252",
"9608795209",
"-102452031878",
"2017846993905",
"-24588487650736",
"548854382342177",
"-7524077221125234",
"187708198761024553",
"-2859149344027588940",
"78837443479630312281",
"-1320926996940746090302"
] |
[
"sign"
] | 96 | 1 | 2 |
[
"A000166",
"A000522",
"A002747",
"A087208"
] |
[
"M1924",
"N0759"
] |
N. J. A. Sloane
| 2024-10-19T18:33:52 |
oeisdata/seq/A002/A002747.seq
|
de814f45c209df52c46e0b41199ed08b
|
A002748
|
Sum of logarithmic numbers.
|
[
"1",
"2",
"3",
"26",
"13",
"1074",
"-1457",
"61802",
"7929",
"4218722",
"-6385349",
"934344762",
"-5065189307",
"141111736466",
"235257551943",
"23219206152074",
"-97011062913167",
"11887164842925762",
"-91890238533000461",
"4819930221202545242",
"-14547510704199530499",
"1184314832978574919922"
] |
[
"sign",
"easy"
] | 28 | 0 | 2 |
[
"A002748",
"A002750"
] |
[
"M0923",
"N0347"
] |
N. J. A. Sloane
| 2015-08-02T20:23:18 |
oeisdata/seq/A002/A002748.seq
|
3966a47b2ecdbc5dfc9c581a5fadac92
|
A002749
|
Sum of logarithmic numbers.
|
[
"1",
"1",
"1",
"11",
"-7",
"389",
"-1031",
"19039",
"-24431",
"1023497",
"-4044079",
"225738611",
"-1711460279",
"29974303501",
"4656373513",
"3798866053319",
"-34131041040991",
"2131052083901969",
"-23678368533941471",
"832900320313739227",
"-4752766287768240359",
"148482851420849206421"
] |
[
"sign"
] | 27 | 0 | 4 | null |
[
"M4767",
"N2037"
] |
N. J. A. Sloane
| 2023-10-20T09:39:05 |
oeisdata/seq/A002/A002749.seq
|
ed6b908463956001ce423444a95bf1d2
|
A002750
|
Sum of logarithmic numbers.
|
[
"1",
"4",
"15",
"76",
"373",
"2676",
"17539",
"152860",
"1383561",
"14658148",
"143131351",
"2070738924",
"24754959805",
"341745565396",
"5260157782923",
"92358395065276",
"1377499388715409",
"27622124789948100",
"476285499100204831",
"10464946811144407948",
"222724531608924013701"
] |
[
"nonn"
] | 33 | 0 | 2 |
[
"A000203",
"A002750"
] |
[
"M3506",
"N1422"
] |
N. J. A. Sloane
| 2024-11-19T10:35:16 |
oeisdata/seq/A002/A002750.seq
|
d90277af72346c13be7430e033b5bb96
|
A002751
|
Sum of logarithmic numbers.
|
[
"1",
"3",
"9",
"37",
"153",
"951",
"5473",
"42729",
"353937",
"3455083",
"30071001",
"426685293",
"4707929449",
"59350096287",
"882391484913",
"15177204356401",
"205119866263713",
"4040196156574419",
"64262949875511337",
"1408785031894483893",
"29514546353782633401",
"593055713389216814983"
] |
[
"nonn"
] | 27 | 0 | 2 | null |
[
"M2821",
"N1135"
] |
N. J. A. Sloane
| 2023-10-20T09:40:35 |
oeisdata/seq/A002/A002751.seq
|
09469c29fb238ecaef2631c6e18f33bb
|
A002752
|
a(n) = Fibonacci(n-1) mod n.
|
[
"0",
"1",
"1",
"2",
"3",
"5",
"1",
"5",
"3",
"4",
"0",
"5",
"1",
"9",
"2",
"2",
"1",
"13",
"0",
"1",
"3",
"12",
"1",
"1",
"18",
"15",
"1",
"26",
"0",
"29",
"0",
"29",
"12",
"2",
"22",
"17",
"1",
"1",
"29",
"26",
"0",
"13",
"1",
"13",
"33",
"2",
"1",
"1",
"21",
"49",
"37",
"18",
"1",
"23",
"47",
"13",
"39",
"30",
"0",
"41",
"0",
"1",
"62",
"34",
"8",
"49",
"1",
"5",
"3",
"54",
"0",
"1",
"1",
"39",
"7",
"2",
"74"
] |
[
"nonn"
] | 21 | 1 | 4 |
[
"A000045",
"A002708",
"A002752",
"A352747"
] | null |
John C. Hallyburton, Jr. (hallyb(AT)evms.ENET.dec.com)
| 2022-04-11T12:54:32 |
oeisdata/seq/A002/A002752.seq
|
b869eb8fbd15d67dbc7ad1dc68158af2
|
A002753
|
Coefficients of elliptic function sn.
|
[
"1",
"1",
"14",
"135",
"5478",
"165826",
"13180268",
"834687179",
"109645021894",
"11966116940238",
"2347836365864484",
"393938089395885894",
"107947764316226205276",
"25835579116799316507780"
] |
[
"nonn"
] | 38 | 0 | 3 |
[
"A002753",
"A006089",
"A060628"
] |
[
"M4944",
"N2117"
] |
N. J. A. Sloane
| 2023-10-20T09:42:47 |
oeisdata/seq/A002/A002753.seq
|
a2073703bd1c683eacc23255e885dd05
|
A002754
|
Related to coefficient of m in Jacobi elliptic function cn(z, m).
|
[
"0",
"0",
"4",
"44",
"408",
"3688",
"33212",
"298932",
"2690416",
"24213776",
"217924020",
"1961316220",
"17651846024",
"158866614264",
"1429799528428",
"12868195755908",
"115813761803232",
"1042323856229152",
"9380914706062436",
"84428232354561996",
"759854091191058040"
] |
[
"nonn",
"easy"
] | 51 | 0 | 3 |
[
"A002754",
"A014832",
"A060627"
] |
[
"M3680",
"N1501"
] |
N. J. A. Sloane
| 2023-08-23T08:35:08 |
oeisdata/seq/A002/A002754.seq
|
8ba5e799f4f6618d0c25de89993309d1
|
A002755
|
Number of bipartite partitions of n white objects and 6 black ones.
|
[
"11",
"30",
"77",
"162",
"323",
"589",
"1043",
"1752",
"2876",
"4571",
"7128",
"10860",
"16306",
"24051",
"35040",
"50355",
"71609",
"100697",
"140349",
"193784",
"265505",
"360889",
"487214",
"653243",
"870613",
"1153322",
"1519658",
"1991689",
"2597762",
"3372107",
"4358198",
"5608418",
"7188632"
] |
[
"nonn"
] | 47 | 0 | 1 |
[
"A002755",
"A005380",
"A054225"
] |
[
"M4784",
"N2041"
] |
N. J. A. Sloane
| 2024-01-01T08:01:26 |
oeisdata/seq/A002/A002755.seq
|
e86112a3f8f498e1809b31168bfc0ded
|
A002756
|
Number of bipartite partitions of n white objects and 7 black ones.
|
[
"15",
"45",
"118",
"257",
"522",
"975",
"1752",
"2998",
"4987",
"8043",
"12693",
"19584",
"29719",
"44324",
"65210",
"94642",
"135805",
"192699",
"270822",
"377048",
"520624",
"713123",
"969784",
"1309646",
"1757447",
"2343931",
"3108553",
"4100220",
"5380964",
"7027376",
"9135769",
"11824507"
] |
[
"nonn"
] | 42 | 0 | 1 |
[
"A002756",
"A005380",
"A054225"
] |
[
"M4964",
"N2129"
] |
N. J. A. Sloane
| 2024-01-01T08:01:21 |
oeisdata/seq/A002/A002756.seq
|
93e32f06965929531d015be3593fecbc
|
A002757
|
Number of bipartite partitions of n white objects and 8 black ones.
|
[
"22",
"67",
"181",
"401",
"831",
"1576",
"2876",
"4987",
"8406",
"13715",
"21893",
"34134",
"52327",
"78785",
"116982",
"171259",
"247826",
"354482",
"502090",
"704265",
"979528",
"1351109",
"1849932",
"2514723",
"3396262",
"4557867",
"6081466",
"8068930",
"10650479",
"13987419",
"18283999"
] |
[
"nonn"
] | 41 | 0 | 1 |
[
"A002757",
"A005380",
"A054225"
] |
[
"M5123",
"N2219"
] |
N. J. A. Sloane
| 2024-01-01T08:01:16 |
oeisdata/seq/A002/A002757.seq
|
45fa27d1f18a07cb2c77cf8d05a21dd0
|
A002758
|
Number of bipartite partitions of n white objects and 9 black ones.
|
[
"30",
"97",
"267",
"608",
"1279",
"2472",
"4571",
"8043",
"13715",
"22652",
"36535",
"57568",
"89079",
"135384",
"202747",
"299344",
"436597",
"629364",
"897970",
"1268634",
"1776562",
"2466961",
"3399463",
"4650218",
"6318429",
"8529869",
"11446563",
"15272827",
"20269135",
"26762094"
] |
[
"nonn"
] | 41 | 0 | 1 |
[
"A002758",
"A005380",
"A054225"
] |
[
"M5209",
"N2265"
] |
N. J. A. Sloane
| 2024-01-01T08:01:11 |
oeisdata/seq/A002/A002758.seq
|
7500a0bac551f348f27ae02bcb032920
|
A002759
|
Number of bipartite partitions of n white objects and 10 black ones.
|
[
"42",
"139",
"392",
"907",
"1941",
"3804",
"7128",
"12693",
"21893",
"36535",
"59521",
"94664",
"147794",
"226524",
"342006",
"508866",
"747753",
"1085635",
"1559725",
"2218272",
"3126541",
"4368724",
"6056705",
"8333955",
"11388614",
"15460291",
"20859497",
"27979454",
"37324367",
"49529018"
] |
[
"nonn"
] | 41 | 0 | 1 |
[
"A002759",
"A005380",
"A054225"
] |
[
"M5278",
"N2295"
] |
N. J. A. Sloane
| 2024-01-01T08:01:07 |
oeisdata/seq/A002/A002759.seq
|
68a799eaba0e835985a19d49da15dc86
|
A002760
|
Squares and cubes.
|
[
"0",
"1",
"4",
"8",
"9",
"16",
"25",
"27",
"36",
"49",
"64",
"81",
"100",
"121",
"125",
"144",
"169",
"196",
"216",
"225",
"256",
"289",
"324",
"343",
"361",
"400",
"441",
"484",
"512",
"529",
"576",
"625",
"676",
"729",
"784",
"841",
"900",
"961",
"1000",
"1024",
"1089",
"1156",
"1225",
"1296",
"1331",
"1369",
"1444",
"1521",
"1600",
"1681",
"1728",
"1764",
"1849"
] |
[
"nonn"
] | 55 | 1 | 3 |
[
"A000290",
"A000578",
"A002117",
"A002760",
"A013661",
"A013664",
"A075052",
"A131799"
] | null |
N. J. A. Sloane
| 2024-08-09T10:07:24 |
oeisdata/seq/A002/A002760.seq
|
5f41a9c403521113faeaefc4113bdce2
|
A002761
|
Number of ways of getting a royal flush, other straight flush, 4 of a kind, full house, other flush, other straight, 3 of a kind, 2 pair, a pair or nothing in 5-card poker.
|
[
"4",
"36",
"624",
"3744",
"5108",
"10200",
"54912",
"123552",
"1098240",
"1302540"
] |
[
"fini",
"full",
"nonn"
] | 16 | 1 | 1 |
[
"A002761",
"A002806",
"A002847"
] | null |
N. J. A. Sloane, Koreen M Mielke (mielkk72(AT)VAXA.CIS.UWOSH.EDU)
| 2019-04-09T05:12:46 |
oeisdata/seq/A002/A002761.seq
|
c4de14ba0a17d26aabdb7a3f66943851
|
A002762
|
Number of bipartite partitions.
|
[
"4",
"9",
"21",
"40",
"74",
"125",
"209",
"330",
"515",
"778",
"1160",
"1690",
"2439",
"3457",
"4857",
"6735",
"9264",
"12607",
"17040",
"22826",
"30391",
"40165",
"52788",
"68938",
"89589",
"115778",
"148957",
"190714",
"243184",
"308746",
"390539",
"492071",
"617900",
"773175",
"964443",
"1199168",
"1486724",
"1837806"
] |
[
"nonn"
] | 22 | 0 | 1 | null |
[
"M3362",
"N1354"
] |
N. J. A. Sloane
| 2023-10-20T10:05:18 |
oeisdata/seq/A002/A002762.seq
|
61b93b0b2c4f385f81eda1274a6fd6d3
|
A002763
|
Number of bipartite partitions.
|
[
"4",
"11",
"26",
"52",
"98",
"171",
"289",
"467",
"737",
"1131",
"1704",
"2515",
"3661",
"5246",
"7430",
"10396",
"14405",
"19760",
"26884",
"36269",
"48583",
"64614",
"85399",
"112170",
"146526",
"190362",
"246099",
"316621",
"405556",
"517224",
"657012",
"831320",
"1048055",
"1316611",
"1648486",
"2057324",
"2559719",
"3175309"
] |
[
"nonn"
] | 33 | 0 | 1 |
[
"A002763",
"A082775",
"A129306"
] |
[
"M3414",
"N1380"
] |
N. J. A. Sloane
| 2021-12-20T20:18:42 |
oeisdata/seq/A002/A002763.seq
|
f036f87fb3e0c8126ee18e04f2df238e
|
A002764
|
Number of bipartite partitions.
|
[
"7",
"18",
"44",
"88",
"169",
"296",
"507",
"824",
"1314",
"2029",
"3083",
"4578",
"6714",
"9676",
"13795",
"19408",
"27053",
"37302",
"51029",
"69180",
"93139",
"124447",
"165259",
"218021",
"286068",
"373207",
"484512",
"625845",
"804840",
"1030369",
"1313823",
"1668466",
"2111101",
"2661365",
"3343811",
"4187191"
] |
[
"nonn"
] | 19 | 0 | 1 | null |
[
"M4359",
"N1827"
] |
N. J. A. Sloane
| 2023-10-20T10:06:05 |
oeisdata/seq/A002/A002764.seq
|
bfa84bffd399ded981fd790c22658566
|
A002765
|
Number of bipartite partitions.
|
[
"8",
"23",
"57",
"119",
"231",
"415",
"719",
"1189",
"1915",
"2997",
"4595",
"6898",
"10198",
"14833",
"21303",
"30211",
"42393",
"58869",
"81028",
"110551",
"149683",
"201160",
"268539",
"356167",
"469630",
"615712",
"803029",
"1042051",
"1345896",
"1730473",
"2215561",
"2825037",
"3588364",
"4541036"
] |
[
"nonn"
] | 20 | 0 | 1 | null |
[
"M4495",
"N1902"
] |
N. J. A. Sloane
| 2023-10-20T10:06:49 |
oeisdata/seq/A002/A002765.seq
|
96882a7064db9712f5e3562d417e4c89
|
A002766
|
Number of bipartite partitions.
|
[
"4",
"10",
"23",
"45",
"83",
"142",
"237",
"377",
"588",
"892",
"1330",
"1943",
"2804",
"3982",
"5595",
"7768",
"10686",
"14555",
"19674",
"26371",
"35112",
"46424",
"61015",
"79705",
"103579",
"133883",
"172243",
"220551",
"281212",
"357043",
"451592",
"568997",
"714424",
"893921",
"1114930",
"1386187"
] |
[
"nonn",
"more"
] | 19 | 1 | 1 | null |
[
"M3387",
"N1367"
] |
N. J. A. Sloane
| 2023-10-20T10:07:33 |
oeisdata/seq/A002/A002766.seq
|
27b624c7aa3f43702ff29a6064a6ebc7
|
A002767
|
Number of bipartite partitions.
|
[
"5",
"12",
"28",
"54",
"100",
"170",
"284",
"450",
"702",
"1062",
"1583",
"2308",
"3329",
"4720",
"6628",
"9190",
"12634",
"17189",
"23219",
"31092",
"41371",
"54651",
"71782",
"93695",
"121684",
"157169",
"202080",
"258579",
"329509",
"418096",
"528518",
"665521",
"835170",
"1044408",
"1301949",
"1617830"
] |
[
"nonn"
] | 19 | 0 | 1 | null |
[
"M3820",
"N1564"
] |
N. J. A. Sloane
| 2023-10-20T10:08:30 |
oeisdata/seq/A002/A002767.seq
|
b968ecc4102805c8a782670060434403
|
A002768
|
Number of bipartite partitions.
|
[
"5",
"13",
"30",
"59",
"109",
"187",
"312",
"497",
"775",
"1176",
"1753",
"2561",
"3694",
"5245",
"7366",
"10223",
"14056",
"19137",
"25853",
"34637",
"46092",
"60910",
"80009",
"104462",
"135674",
"175274"
] |
[
"nonn"
] | 19 | 0 | 1 | null |
[
"M3831",
"N1571"
] |
N. J. A. Sloane
| 2023-10-20T10:09:10 |
oeisdata/seq/A002/A002768.seq
|
990ce24fa32e9354f48c998a9ae78e8a
|
A002769
|
Discriminants of totally real quartic fields (see comments).
|
[
"725",
"1125",
"1600",
"2000",
"2048",
"2225",
"2304",
"2525",
"2624",
"3600",
"4205",
"4225",
"4352",
"4400",
"4525",
"4752",
"4913",
"5125",
"5225",
"5725",
"6125",
"7056",
"7168",
"7225",
"7232",
"7488",
"7600",
"7625",
"8000",
"8112",
"8525",
"8725",
"8768",
"8957",
"9225",
"9248",
"9792",
"10025",
"10304",
"10309",
"10512"
] |
[
"nonn",
"nice"
] | 25 | 1 | 1 |
[
"A002769",
"A023680"
] |
[
"M5475",
"N2371"
] |
N. J. A. Sloane
| 2022-01-29T01:02:13 |
oeisdata/seq/A002/A002769.seq
|
82a80d409997f009222ccfda00284d52
|
A002770
|
Integers connected with coefficients in expansion of Weierstrass P-function.
|
[
"-1",
"5",
"253",
"39299",
"13265939",
"8616924013",
"9833937781275",
"18382040180023477",
"53311001020080183933",
"229658082900486063068939",
"1418085582879166915943461879",
"12182969300667152908506740224429",
"141998788870155117956738989275999795"
] |
[
"sign",
"easy",
"nice"
] | 44 | 2 | 2 |
[
"A002172",
"A002306",
"A002770",
"A047817"
] |
[
"M4033",
"N1675"
] |
N. J. A. Sloane
| 2018-02-26T00:53:26 |
oeisdata/seq/A002/A002770.seq
|
ce6914f79166fcf76fff646a76d1c701
|
A002771
|
Number of terms in a skew determinant: a(n) = (A000085(n) + A081919(n))/2.
|
[
"1",
"2",
"4",
"13",
"41",
"226",
"1072",
"9374",
"60958",
"723916",
"5892536",
"86402812",
"837641884",
"14512333928",
"162925851376",
"3252104882056",
"41477207604872",
"937014810365584",
"13380460644770848",
"337457467862898896",
"5333575373478669136",
"148532521250931168352"
] |
[
"nonn"
] | 50 | 1 | 2 |
[
"A000085",
"A002771",
"A002772",
"A081919"
] |
[
"M1269",
"N0488"
] |
N. J. A. Sloane
| 2023-10-20T11:54:30 |
oeisdata/seq/A002/A002771.seq
|
fdebdbc786962a37a0dfb38e51603893
|
A002772
|
Number of terms in a bordered skew determinant.
|
[
"2",
"6",
"22",
"101",
"546",
"3502",
"25586",
"214062",
"1987516",
"20599076",
"232482372",
"2876191276",
"38228128472",
"549706132536",
"8408517839416",
"137788390312712",
"2383879842920976",
"43846851982943152",
"846470648320690736",
"17266870434276713616",
"367937854493289655072"
] |
[
"nonn"
] | 36 | 2 | 1 |
[
"A002771",
"A002772",
"A243107"
] |
[
"M1664",
"N0654"
] |
N. J. A. Sloane
| 2023-10-20T11:52:47 |
oeisdata/seq/A002/A002772.seq
|
6f458d9cd45773a3612f7d623fdc0b08
|
A002773
|
Number of nonisomorphic simple matroids (or geometries) with n points.
|
[
"1",
"1",
"1",
"2",
"4",
"9",
"26",
"101",
"950",
"376467"
] |
[
"nonn",
"nice",
"more"
] | 84 | 0 | 4 |
[
"A002773",
"A055545",
"A056642",
"A058730"
] |
[
"M1197",
"N0462"
] |
N. J. A. Sloane
| 2025-02-16T08:32:26 |
oeisdata/seq/A002/A002773.seq
|
5b012cfa318d91e395565e29f79fd895
|
A002774
|
Number of bipartite partitions of n white objects and n black ones.
|
[
"1",
"2",
"9",
"31",
"109",
"339",
"1043",
"2998",
"8406",
"22652",
"59521",
"151958",
"379693",
"927622",
"2224235",
"5236586",
"12130780",
"27669593",
"62229990",
"138095696",
"302673029",
"655627975",
"1404599867",
"2977831389",
"6251060785",
"12999299705",
"26791990052",
"54750235190",
"110977389012"
] |
[
"nonn"
] | 101 | 0 | 2 |
[
"A000041",
"A000070",
"A000291",
"A000412",
"A000465",
"A000491",
"A002755",
"A002756",
"A002757",
"A002758",
"A002759",
"A002774",
"A005380",
"A054225",
"A219554",
"A219727",
"A277239"
] |
[
"M1925",
"N0760"
] |
N. J. A. Sloane
| 2025-03-24T12:47:27 |
oeisdata/seq/A002/A002774.seq
|
49f3b4567390afd158c54cb85860b557
|
A002775
|
a(n) = n^2 * n!.
|
[
"0",
"1",
"8",
"54",
"384",
"3000",
"25920",
"246960",
"2580480",
"29393280",
"362880000",
"4829932800",
"68976230400",
"1052366515200",
"17086945075200",
"294226732800000",
"5356234211328000",
"102793666719744000",
"2074369080655872000",
"43913881247588352000",
"973160803270656000000",
"22531105497723863040000"
] |
[
"nonn",
"easy"
] | 66 | 0 | 3 |
[
"A000142",
"A000290",
"A001563",
"A002775",
"A047922",
"A091363",
"A091364",
"A163931",
"A367731",
"A367732"
] |
[
"M4540",
"N1927"
] |
N. J. A. Sloane
| 2025-04-18T07:07:33 |
oeisdata/seq/A002/A002775.seq
|
86f398d2ad129689b93bacaf6dbe72e2
|
A002776
|
Terms in certain determinants.
|
[
"1",
"5",
"34",
"258",
"2136",
"19320",
"190800",
"2051280",
"23909760",
"300827520",
"4067884800",
"58877280000",
"908666035200",
"14901260774400",
"258832346572800",
"4748165630208000",
"91746433658880000",
"1862735060938752000",
"39649900359573504000",
"883021783867711488000"
] |
[
"nonn",
"easy",
"nice"
] | 43 | 0 | 2 |
[
"A002776",
"A047922"
] |
[
"M3972",
"N1642"
] |
N. J. A. Sloane
| 2022-04-17T10:24:08 |
oeisdata/seq/A002/A002776.seq
|
8409825d5ee68f5d6bbddc607e2ee6fd
|
A002777
|
Restricted permutations.
|
[
"1",
"0",
"0",
"0",
"4",
"16",
"80",
"672",
"4896",
"49920",
"460032",
"5598720",
"62584320",
"885381120",
"11644323840",
"187811205120",
"2841958748160",
"51481298534400",
"881192033648640",
"17714783352913920",
"338434210452602880",
"7477275543168614400"
] |
[
"nonn",
"easy"
] | 38 | 0 | 5 |
[
"A002777",
"A003471"
] |
[
"M3526",
"N1432"
] |
N. J. A. Sloane
| 2024-04-20T15:18:26 |
oeisdata/seq/A002/A002777.seq
|
e2725379a3edd4e0a0d68a4679908ead
|
A002778
|
Numbers whose square is a palindrome.
|
[
"0",
"1",
"2",
"3",
"11",
"22",
"26",
"101",
"111",
"121",
"202",
"212",
"264",
"307",
"836",
"1001",
"1111",
"2002",
"2285",
"2636",
"10001",
"10101",
"10201",
"11011",
"11111",
"11211",
"20002",
"20102",
"22865",
"24846",
"30693",
"100001",
"101101",
"110011",
"111111",
"200002",
"798644",
"1000001",
"1001001"
] |
[
"base",
"nonn",
"nice",
"easy"
] | 94 | 1 | 3 |
[
"A000290",
"A002113",
"A002778",
"A002779",
"A003166",
"A016113",
"A029984",
"A136522",
"A263607"
] |
[
"M0907",
"N0342"
] |
N. J. A. Sloane
| 2025-04-02T18:04:06 |
oeisdata/seq/A002/A002778.seq
|
8f41049d09c7bfb214d481747f5a5e81
|
A002779
|
Palindromic squares.
|
[
"0",
"1",
"4",
"9",
"121",
"484",
"676",
"10201",
"12321",
"14641",
"40804",
"44944",
"69696",
"94249",
"698896",
"1002001",
"1234321",
"4008004",
"5221225",
"6948496",
"100020001",
"102030201",
"104060401",
"121242121",
"123454321",
"125686521",
"400080004",
"404090404",
"522808225"
] |
[
"nonn",
"base",
"nice",
"easy"
] | 106 | 1 | 3 |
[
"A000290",
"A002113",
"A002778",
"A002779",
"A010052",
"A027829",
"A028817",
"A029734",
"A029738",
"A029806",
"A029983",
"A029985",
"A029987",
"A029989",
"A029991",
"A029993",
"A029995",
"A029997",
"A029999",
"A030074",
"A030075",
"A057136",
"A136522"
] |
[
"M3371",
"N1358"
] |
N. J. A. Sloane
| 2025-02-16T08:32:26 |
oeisdata/seq/A002/A002779.seq
|
9654a91c691d198227e88aedb184abe2
|
A002780
|
Numbers whose cube is a palindrome.
|
[
"0",
"1",
"2",
"7",
"11",
"101",
"111",
"1001",
"2201",
"10001",
"10101",
"11011",
"100001",
"101101",
"110011",
"1000001",
"1001001",
"1100011",
"10000001",
"10011001",
"10100101",
"11000011",
"100000001",
"100010001",
"100101001",
"101000101",
"110000011",
"1000000001",
"1000110001"
] |
[
"base",
"nonn",
"nice"
] | 42 | 1 | 3 |
[
"A002780",
"A002781"
] |
[
"M1736",
"N0688"
] |
N. J. A. Sloane
| 2022-08-02T15:39:51 |
oeisdata/seq/A002/A002780.seq
|
c1c166524a6789f9de98b0e23e2e0ab3
|
A002781
|
Palindromic cubes.
|
[
"0",
"1",
"8",
"343",
"1331",
"1030301",
"1367631",
"1003003001",
"10662526601",
"1000300030001",
"1030607060301",
"1334996994331",
"1000030000300001",
"1033394994933301",
"1331399339931331",
"1000003000003000001",
"1003006007006003001",
"1331039930399301331"
] |
[
"base",
"nonn",
"nice"
] | 35 | 1 | 3 |
[
"A000578",
"A002113",
"A002780",
"A002781"
] |
[
"M4583",
"N1954"
] |
N. J. A. Sloane
| 2025-01-05T19:51:32 |
oeisdata/seq/A002/A002781.seq
|
6abf1111185ab3b5c9346cf94c61dd6f
|
A002782
|
Concatenate the natural numbers, then partition into minimal strings so that each term divides the next.
|
[
"1",
"2",
"34",
"5678",
"9101112131415161718192021222324252627282930313233343536"
] |
[
"nonn",
"base",
"nice"
] | 34 | 1 | 2 |
[
"A002782",
"A007376",
"A007908",
"A258227",
"A263623"
] |
[
"M2157",
"N0859"
] |
N. J. A. Sloane
| 2022-01-29T01:01:43 |
oeisdata/seq/A002/A002782.seq
|
51e7f8dc1d610afe18238ac3c41f38fd
|
A002783
|
a(n) = 2*(3^n - 2^n) + 1.
|
[
"1",
"3",
"11",
"39",
"131",
"423",
"1331",
"4119",
"12611",
"38343",
"116051",
"350199",
"1054691",
"3172263",
"9533171",
"28632279",
"85962371",
"258018183",
"774316691",
"2323474359",
"6971471651",
"20916512103",
"62753730611",
"188269580439",
"564825518531",
"1694510110023",
"5083597438931",
"15250926534519"
] |
[
"nonn",
"easy"
] | 68 | 0 | 2 |
[
"A002783",
"A027649",
"A090326",
"A095121"
] |
[
"M2892",
"N1159"
] |
N. J. A. Sloane
| 2024-05-18T14:53:07 |
oeisdata/seq/A002/A002783.seq
|
864c3a036268076e33ca7aee0c9a9093
|
A002784
|
A problem in parity.
|
[
"1",
"1",
"1",
"2",
"3",
"1",
"1",
"4",
"5",
"1",
"3",
"1",
"3",
"1",
"1",
"8",
"15",
"3",
"7",
"4",
"5",
"2",
"3",
"3",
"6",
"2",
"3",
"2",
"3",
"1",
"1",
"16",
"19",
"7",
"10",
"5",
"15",
"4",
"5",
"7",
"15",
"3",
"7",
"4",
"5",
"2",
"3",
"5",
"13",
"3",
"5",
"4",
"7",
"1",
"3",
"3",
"5",
"2",
"3",
"1",
"3",
"1",
"1",
"32",
"47",
"11",
"31",
"14",
"21",
"6",
"15",
"11",
"31",
"7",
"9",
"7",
"12",
"3",
"7",
"12",
"21",
"7",
"15",
"4",
"11",
"4",
"5",
"7",
"15",
"2",
"7",
"4",
"5"
] |
[
"nonn"
] | 19 | 1 | 4 |
[
"A002784",
"A050169",
"A073166"
] |
[
"M0401",
"N0154"
] |
N. J. A. Sloane
| 2023-10-20T21:12:44 |
oeisdata/seq/A002/A002784.seq
|
14fa407c2390a4ed5b2e506ec14d42d7
|
A002785
|
Number of self-complementary oriented graphs with n nodes.
|
[
"1",
"1",
"2",
"2",
"8",
"12",
"88",
"176",
"2752",
"8784",
"279968",
"1492288",
"95458560",
"872687552",
"111698291584",
"1787154671104",
"457509297625088",
"13013584213369088",
"6662951988432581120",
"341143107490935724032",
"349330527429800077778944",
"32519496073514216703585280"
] |
[
"nonn",
"nice",
"easy"
] | 40 | 1 | 3 |
[
"A000171",
"A002785",
"A003086",
"A005639"
] |
[
"M0375",
"N0141"
] |
N. J. A. Sloane
| 2021-01-07T15:09:19 |
oeisdata/seq/A002/A002785.seq
|
0cd45fdd1b63eab6ffda071b721ad169
|
A002786
|
Semigroups of order n with 1 idempotent, considered to be equivalent when they are isomorphic or anti-isomorphic (by reversal of the operator).
|
[
"1",
"2",
"5",
"19",
"132",
"3107",
"623615",
"1834861133",
"52976551026562",
"12417619575092896741"
] |
[
"nonn",
"nice",
"hard"
] | 28 | 1 | 2 |
[
"A002786",
"A058123"
] |
[
"M1522",
"N0596"
] |
N. J. A. Sloane
| 2025-02-16T08:32:26 |
oeisdata/seq/A002/A002786.seq
|
b22c27083a1b5da38073ea8009e44428
|
A002787
|
Number of semigroups of order n with 2 idempotents, considered to be equivalent when they are isomorphic or anti-isomorphic (by reversal of the operator).
|
[
"2",
"7",
"37",
"216",
"1780",
"32652",
"4665709",
"12710266442",
"381279977009776"
] |
[
"nonn",
"hard",
"more"
] | 33 | 2 | 1 |
[
"A002787",
"A058123"
] |
[
"M1802",
"N0712"
] |
N. J. A. Sloane
| 2025-02-16T08:32:26 |
oeisdata/seq/A002/A002787.seq
|
eeaac66d5bd5ff35a8c399ec25bf9bcf
|
A002788
|
Idempotent semigroups of order n, considered to be equivalent when they are isomorphic or anti-isomorphic (by reversal of the operator).
|
[
"1",
"1",
"2",
"6",
"26",
"135",
"875",
"6749",
"60601",
"618111",
"7033090"
] |
[
"nonn",
"nice",
"hard"
] | 27 | 0 | 3 |
[
"A001423",
"A002788",
"A058123"
] |
[
"M1679",
"N0661"
] |
N. J. A. Sloane
| 2025-02-16T08:32:26 |
oeisdata/seq/A002/A002788.seq
|
8658fe8fa668091ae65c3ea138e4378a
|
A002789
|
Number of integer points in a certain quadrilateral scaled by a factor of n.
|
[
"2",
"4",
"7",
"11",
"16",
"21",
"28",
"35",
"43",
"52",
"62",
"72",
"84",
"96",
"109",
"123",
"138",
"153",
"170",
"187",
"205",
"224",
"244",
"264",
"286",
"308",
"331",
"355",
"380",
"405",
"432",
"459",
"487",
"516",
"546",
"576",
"608",
"640",
"673",
"707",
"742",
"777",
"814",
"851",
"889",
"928",
"968",
"1008",
"1050",
"1092",
"1135",
"1179",
"1224",
"1269"
] |
[
"nonn"
] | 29 | 1 | 1 |
[
"A002789",
"A168668",
"A242771",
"A242774"
] |
[
"M1039",
"N0390"
] |
N. J. A. Sloane
| 2015-10-23T19:38:40 |
oeisdata/seq/A002/A002789.seq
|
22b400b8bb8a12d4ae5381e4bcfb35fb
|
A002790
|
Denominators of Cauchy numbers of second type (= Bernoulli numbers B_n^{(n)}).
|
[
"1",
"2",
"6",
"4",
"30",
"12",
"84",
"24",
"90",
"20",
"132",
"24",
"5460",
"840",
"360",
"16",
"1530",
"180",
"7980",
"840",
"13860",
"440",
"1656",
"720",
"81900",
"6552",
"216",
"112",
"3480",
"240",
"114576",
"7392",
"117810",
"2380",
"1260",
"72",
"3838380",
"207480",
"32760",
"560",
"568260",
"27720",
"238392",
"55440",
"869400",
"2576",
"236880"
] |
[
"nonn",
"frac",
"nice",
"easy"
] | 112 | 0 | 2 |
[
"A002206",
"A002207",
"A002208",
"A002209",
"A002657",
"A002790",
"A006232",
"A006233",
"A075266",
"A075267",
"A262235"
] |
[
"M1559",
"N0608"
] |
N. J. A. Sloane
| 2025-01-05T19:51:32 |
oeisdata/seq/A002/A002790.seq
|
c0a0bff024547b4894fa3a5bc01e35a4
|
A002791
|
a(n) = Sum_{d|n, d <= 4} d^2 + 4*Sum_{d|n, d>4} d.
|
[
"1",
"5",
"10",
"21",
"21",
"38",
"29",
"53",
"46",
"65",
"45",
"102",
"53",
"89",
"90",
"117",
"69",
"146",
"77",
"161",
"122",
"137",
"93",
"230",
"121",
"161",
"154",
"217",
"117",
"278",
"125",
"245",
"186",
"209",
"189",
"354",
"149",
"233",
"218",
"353",
"165",
"374",
"173",
"329",
"306",
"281",
"189",
"486",
"225",
"365",
"282",
"385",
"213",
"470",
"285",
"473",
"314",
"353",
"237",
"662",
"245",
"377",
"410",
"501",
"333",
"566",
"269",
"497"
] |
[
"nonn"
] | 34 | 1 | 2 |
[
"A002659",
"A002660",
"A002791",
"A242639"
] |
[
"M3798",
"N1550"
] |
N. J. A. Sloane
| 2019-08-17T15:48:44 |
oeisdata/seq/A002/A002791.seq
|
e03da52eb4efc14db2bcca75d127286e
|
A002792
|
Erroneous version of A108919.
|
[
"1",
"0",
"1",
"1",
"13",
"51",
"601",
"4806",
"39173",
"775351"
] |
[
"dead"
] | 22 | 0 | 5 | null |
[
"M4897",
"N2099"
] |
N. J. A. Sloane
| 2023-10-20T21:13:50 |
oeisdata/seq/A002/A002792.seq
|
3b40465e570318fe3c4bec96bb419791
|
A002793
|
a(n) = 2n*a(n-1) - (n-1)^2*a(n-2).
|
[
"0",
"1",
"4",
"20",
"124",
"920",
"7940",
"78040",
"859580",
"10477880",
"139931620",
"2030707640",
"31805257340",
"534514790680",
"9591325648580",
"182974870484120",
"3697147584561340",
"78861451031150840",
"1770536585183202980",
"41729280102868841080",
"1030007496863617367420",
"26568602827124392999640"
] |
[
"nonn"
] | 65 | 0 | 3 |
[
"A002720",
"A002793",
"A056952",
"A073003",
"A199577"
] |
[
"M3567",
"N1446"
] |
N. J. A. Sloane, Robert G. Wilson v
| 2022-10-18T19:12:52 |
oeisdata/seq/A002/A002793.seq
|
4d1d8f2212fa6f7575b54909d62f0ad6
|
A002794
|
Numerators of convergents to Lehmer's constant.
|
[
"1",
"1",
"3",
"16",
"547",
"538811",
"620245817465",
"692770666469127829226736",
"1025344764595988314871439243086711931108916434521"
] |
[
"nonn",
"frac",
"nice"
] | 25 | 0 | 3 |
[
"A002065",
"A002665",
"A002794",
"A002795",
"A030125"
] |
[
"M3034",
"N1230"
] |
N. J. A. Sloane
| 2024-10-13T01:26:54 |
oeisdata/seq/A002/A002794.seq
|
7097cb0480e7c6f4cbd81f5e795d8b6d
|
A002795
|
Denominators of convergents to Lehmer's constant.
|
[
"1",
"2",
"5",
"27",
"923",
"909182",
"1046593950039",
"1168971346319460027570137",
"1730152138254248421873938035305987364739567671241"
] |
[
"nonn",
"frac"
] | 21 | 0 | 2 |
[
"A002065",
"A002665",
"A002794",
"A002795",
"A030125"
] |
[
"M1545",
"N0603"
] |
N. J. A. Sloane
| 2024-10-13T01:27:18 |
oeisdata/seq/A002/A002795.seq
|
1be69e809d26f025dfbc839017559585
|
A002796
|
Numbers that are divisible by each nonzero digit.
|
[
"1",
"2",
"3",
"4",
"5",
"6",
"7",
"8",
"9",
"10",
"11",
"12",
"15",
"20",
"22",
"24",
"30",
"33",
"36",
"40",
"44",
"48",
"50",
"55",
"60",
"66",
"70",
"77",
"80",
"88",
"90",
"99",
"100",
"101",
"102",
"104",
"105",
"110",
"111",
"112",
"115",
"120",
"122",
"124",
"126",
"128",
"132",
"135",
"140",
"144",
"150",
"155",
"162",
"168",
"175",
"184",
"200",
"202",
"204",
"208",
"210",
"212"
] |
[
"nonn",
"base",
"easy",
"nice"
] | 69 | 1 | 2 |
[
"A002796",
"A007602",
"A034838",
"A067458",
"A171492",
"A237851"
] |
[
"M0474",
"N0175"
] |
N. J. A. Sloane
| 2022-09-08T08:44:31 |
oeisdata/seq/A002/A002796.seq
|
a82106d2cdffec70b44d608a104ecadc
|
A002797
|
Number of solutions to a linear inequality.
|
[
"3",
"2",
"5",
"9",
"17",
"27",
"40",
"55",
"73",
"94",
"117",
"143",
"171",
"203",
"236",
"273",
"311",
"354",
"397",
"445",
"493",
"547",
"600",
"659",
"717",
"782",
"845",
"915",
"983",
"1059",
"1132",
"1213",
"1291",
"1378",
"1461",
"1553",
"1641",
"1739",
"1832",
"1935",
"2033",
"2142",
"2245",
"2359",
"2467",
"2587",
"2700"
] |
[
"nonn",
"easy"
] | 27 | 0 | 1 | null |
[
"M1360",
"N0524"
] |
N. J. A. Sloane
| 2023-06-25T19:59:55 |
oeisdata/seq/A002/A002797.seq
|
54cd459f1268a014a665ecfa2d5630d4
|
A002798
|
a(n) = a(n-1) + a(n-2) - a(n-3).
|
[
"18",
"45",
"69",
"96",
"120",
"147",
"171",
"198",
"222",
"249",
"273",
"300",
"324",
"351",
"375",
"402",
"426",
"453",
"477",
"504",
"528",
"555",
"579",
"606",
"630",
"657",
"681",
"708",
"732",
"759",
"783",
"810",
"834",
"861",
"885",
"912",
"936",
"963",
"987",
"1014",
"1038",
"1065",
"1089"
] |
[
"nonn"
] | 49 | 1 | 1 |
[
"A002798",
"A007310",
"A047208"
] |
[
"M5055",
"N2186"
] |
N. J. A. Sloane and Simon Plouffe
| 2025-04-02T04:13:26 |
oeisdata/seq/A002/A002798.seq
|
c509b743b4396c3fb3ae1ac3c99e6638
|
A002799
|
Number of 4-line partitions of n (i.e., planar partitions of n with at most 4 lines).
|
[
"1",
"1",
"3",
"6",
"13",
"23",
"45",
"78",
"141",
"239",
"409",
"674",
"1116",
"1794",
"2882",
"4544",
"7131",
"11031",
"16983",
"25844",
"39124",
"58680",
"87538",
"129578",
"190830",
"279140",
"406334",
"588026",
"847034",
"1213764",
"1731780",
"2459244",
"3478185",
"4898285",
"6872041",
"9603356",
"13372607",
"18553871",
"25656865"
] |
[
"nonn"
] | 62 | 0 | 3 |
[
"A000041",
"A000219",
"A000990",
"A000991",
"A001452",
"A002799",
"A225196",
"A225197",
"A225198",
"A225199",
"A242641"
] |
[
"M2563",
"N1014"
] |
N. J. A. Sloane
| 2022-09-08T08:44:31 |
oeisdata/seq/A002/A002799.seq
|
efac9e22245e31ef2d83ac402df7dc47
|
A002800
|
Erroneous version of A001157.
|
[
"1",
"5",
"10",
"21",
"26",
"53",
"50",
"85",
"91",
"130",
"122",
"210",
"170",
"250",
"260",
"341",
"290",
"455"
] |
[
"dead"
] | 13 | 1 | 2 | null |
[
"M3800",
"N1552"
] | null | 2014-05-21T18:02:12 |
oeisdata/seq/A002/A002800.seq
|
92cb9727c70756c778de119bab8397c5
|
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