cp's OEIS Frontend

This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

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A119081 Triangular numbers composed of digits {0,5,7}.

Original entry on oeis.org

55, 5050, 7750, 70500, 500500, 50005000, 5000050000, 500000500000, 7700750050575, 50000005000000, 5000000050000000, 75075057775077570, 500000000500000000, 7550055000555057000, 50000000005000000000, 505750055750070750570, 775077070557070757070
Offset: 1

Views

Author

Giovanni Resta, May 10 2006

Keywords

Links

Crossrefs

Cf. A000217, A119082. See A119033 for a table of cross-references.

Formula

a(n) = A000217(A119082(n)). - Michel Marcus, Mar 23 2023

Extensions

a(16)-a(17) from Tyler Busby, Mar 23 2023

A119083 Triangular numbers composed of digits {0,5,8}.

Original entry on oeis.org

55, 5050, 500500, 50005000, 5000050000, 500000500000, 558080805855, 50000005000000, 808505508008850, 5000000050000000, 500000000500000000, 50000000005000000000, 5000000000050000000000, 5055055888880005805800, 500000000000500000000000
Offset: 1

Views

Author

Giovanni Resta, May 10 2006

Keywords

Links

Crossrefs

Cf. A000217, A119084. See A119033 for a table of cross-references.

Formula

a(n) = A000217(A119084(n)). - Tyler Busby, Mar 27 2023

Extensions

a(15) from Tyler Busby, Mar 27 2023

A119085 Triangular numbers composed of digits {0,5,9}.

Original entry on oeis.org

55, 595, 990, 5050, 5995, 500500, 50005000, 50909095, 50999950, 505000090, 5000050000, 500000500000, 500999999500, 955909595955, 9055595509950, 50000005000000, 59000000095590, 95595999550590, 5000000050000000, 5000990099009950, 5000990999099095
Offset: 1

Views

Author

Giovanni Resta, May 10 2006

Keywords

Links

Crossrefs

Cf. A000217, A058448, A119086. See A119033 for a table of cross-references.

Programs

  • Mathematica
    Rest[Select[FromDigits/@Tuples[{0,5,9},16],OddQ[Sqrt[8#+1]]&]] (* Harvey P. Dale, Apr 14 2019 *)

Formula

a(n) = A000217(A119086(n)). - Tyler Busby, Mar 31 2023

Extensions

a(20)-a(21) from Tyler Busby, Mar 23 2023

A119087 Triangular numbers composed of digits {0,6,7}.

Original entry on oeis.org

6, 66, 666, 6670, 66066, 600060, 67007676, 670677000, 66067760760, 76666077676, 76670776666, 660067006660776, 7600067000007076, 6700677067067607000, 60660060606000770770776700, 776600760606070666600067770, 7766770606766667760666707766
Offset: 1

Views

Author

Giovanni Resta, May 10 2006

Keywords

Links

Crossrefs

Cf. A000217, A058450, A119088. See A119033 for a table of cross-references.

Formula

a(n) = A000217(A119088(n)). - Tyler Busby, Mar 31 2023

Extensions

a(16)-a(17) from Tyler Busby, Mar 23 2023

A119089 Triangular numbers composed of digits {0,6,8}.

Original entry on oeis.org

6, 66, 666, 66066, 600060, 808080868686, 6800080088880, 600060808600606, 6866666600888008866, 8868600066880068688680, 66888008886880660860006, 8068888000086860008866800600800680, 888806860800600880800086860880800680, 8006680886068066868608660888886880660
Offset: 1

Views

Author

Giovanni Resta, May 10 2006

Keywords

Comments

a(15) > 10^40. - Tyler Busby, Mar 15 2023

Links

Crossrefs

Cf. A000217, A119090. See A119033 for a table of cross-references.

Formula

a(n) = A000217(A119090(n)). - Michel Marcus, Mar 16 2023

Extensions

a(12)-a(14) from Tyler Busby, Mar 15 2023

A119091 Triangular numbers composed of digits {0,6,9}.

Original entry on oeis.org

6, 66, 666, 990, 66066, 69006, 600060, 609960, 690900, 969606666, 60690060606, 96960006066, 66999966009690066, 96606660096609006, 6900969009006996666, 9906090099969060666906, 6666999999969090090996690, 60969009000966690090069999000606, 660690009096060660069069660609900960960
Offset: 1

Views

Author

Giovanni Resta, May 10 2006

Keywords

Links

Crossrefs

Cf. A000217, A058452, A119092. See A119033 for a table of cross-references.

Formula

a(n) = A000217(A119092(n)). - Tyler Busby, Mar 26 2023

Extensions

a(18)-a(19) from Tyler Busby, Mar 26 2023

A119093 Triangular numbers composed of digits {0,7,8}.

Original entry on oeis.org

78, 780, 8778, 887778, 88877778, 870800778, 7007800078, 8008780080, 8888777778, 770800800078, 888887777778, 70870887770880, 88888877777778, 7808778880700878, 8888888777777778, 888888887777777778, 70888000778807080078, 88888888877777777778
Offset: 1

Views

Author

Giovanni Resta, May 10 2006

Keywords

Links

Crossrefs

Cf. A000217, A119094. See A119033 for a table of cross-references.

Formula

a(n) = A000217(A119094(n)). - Tyler Busby, Mar 31 2023

Extensions

a(17)-a(18) from Tyler Busby, Mar 23 2023

A119095 Triangular numbers composed of digits {0,8,9}.

Original entry on oeis.org

990, 809809890, 89909089088809980, 98899080989088808000999800
Offset: 1

Views

Author

Giovanni Resta, May 10 2006

Keywords

Comments

a(5) > 10^41. - Tyler Busby, Mar 28 2023

Links

Crossrefs

Cf. A000217, A058456, A119096. See A119033 for a table of cross-references.

Formula

a(n) = A000217(A119096(n)). - Tyler Busby, Mar 28 2023

A119097 Triangular numbers composed of digits {1,2,3}.

Original entry on oeis.org

1, 3, 21, 231, 2211, 3321, 21321, 32131, 222111, 232221, 11132121, 22221111, 22321221, 2222211111, 2223211221, 12221332311, 222222111111, 222232111221, 1121113113121, 1231322213121, 22222221111111, 22222321111221, 2222222211111111, 2222223211111221
Offset: 1

Views

Author

Giovanni Resta, May 10 2006

Keywords

Links

Crossrefs

Cf. A000217, A030174, A119098. See A119033 for a table of cross-references.

Programs

  • Mathematica
    Flatten[Table[Select[FromDigits/@Tuples[{1,2,3},n],IntegerQ[(Sqrt[ 8#+1]- 1)/2]&],{n,14}]] (* Harvey P. Dale, May 16 2014 *)

Formula

a(n) = A000217(A119098(n)). - Tyler Busby, Mar 31 2023

Extensions

a(23)-a(24) from Tyler Busby, Mar 23 2023

A119099 Triangular numbers composed of digits {1,2,4}.

Original entry on oeis.org

1, 21, 2211, 222111, 1422141, 4244241, 22221111, 44241121, 124212441, 2222211111, 222222111111, 22222221111111, 1111114242224421, 2222222211111111, 21414424114444221, 222222222111111111, 1144211112222224221, 22222222221111111111, 44241214122411121441
Offset: 1

Views

Author

Giovanni Resta, May 10 2006

Keywords

Links

Crossrefs

Cf. A000217, A053881, A119100. See A119033 for a table of cross-references.

Formula

a(n) = A000217(A119100(n)). - Michel Marcus, Mar 19 2023

Extensions

a(17)-a(19) from Tyler Busby, Mar 18 2023
Previous Showing 31-40 of 112 results. Next

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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