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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A119131 Numbers k such that the k-th triangular number contains only digits {1,4,9}.

Original entry on oeis.org

1, 13, 313, 538, 13741, 43386, 48886, 991886, 141415133, 2880781113, 4721227413, 19567549258, 538423521386, 137473211871979931561
Offset: 1

Views

Author

Giovanni Resta, May 10 2006

Keywords

Links

Crossrefs

Cf. A000217, A119130. See A119034 for a table of cross-references.

Extensions

a(14) from Max Alekseyev, Aug 15 2013

A119133 Numbers k such that the k-th triangular number contains only digits {1,5,6}.

Original entry on oeis.org

1, 3, 5, 10, 11, 33, 36, 101, 105, 114, 333, 336, 471, 1011, 1063, 1141, 1769, 3333, 3336, 3363, 3366, 5588, 5773, 10114, 10541, 11096, 11411, 15241, 33333, 33336, 33363, 33366, 33663, 56773, 111010, 174101, 333333, 333336, 333363, 333366
Offset: 1

Views

Author

Giovanni Resta, May 10 2006

Keywords

Links

Crossrefs

Cf. A000217, A119132. See A119034 for a table of cross-references.

Programs

  • Mathematica
    (Sqrt[8#+1]-1)/2&/@Select[Flatten[Table[FromDigits/@Tuples[{1,5,6},n],{n,11}]],OddQ[Sqrt[8#+1 ]]&] (* Harvey P. Dale, Nov 02 2014 *)

A119135 Numbers k such that the k-th triangular number contains only digits {1,5,7}.

Original entry on oeis.org

1, 5, 10, 18, 58, 101, 149, 1050, 1885, 5925, 10114, 15173, 47226, 550594, 585005, 1049925, 1533085, 56174285, 104987349, 123053789, 1017425330, 1230586669, 1245114914, 38878044589, 101111538130, 177627538130, 4728038741701
Offset: 1

Views

Author

Giovanni Resta, May 10 2006

Keywords

Links

Crossrefs

Cf. A000217, A119134. See A119034 for a table of cross-references.

Programs

  • Magma
    [n: n in [1..2*10^7] | Set(Intseq(Binomial(n+1, 2))) subset [1, 5, 7]]; // Vincenzo Librandi, Oct 07 2015
  • Mathematica
    Select[Range[2 10^7], Complement[IntegerDigits[Binomial[# + 1, 2]], {1, 5, 7}] == {}&] (* Vincenzo Librandi, Oct 07 2015 *)

A119137 Numbers k such that the k-th triangular number contains only digits {1,5,8}.

Original entry on oeis.org

1, 5, 10, 101, 130, 1078, 1330, 1541, 4730, 10114, 12773, 13330, 41269, 133330, 1333330, 13333330, 133333330, 1333333330, 3430798394, 5506103010, 13333333330, 108245601470, 133333333330, 1305029950270, 1333333333330
Offset: 1

Views

Author

Giovanni Resta, May 10 2006

Keywords

Links

Crossrefs

Cf. A000217, A119136. See A119034 for a table of cross-references.

A119139 Numbers k such that the k-th triangular number contains only digits {1,5,9}.

Original entry on oeis.org

1, 5, 10, 13, 34, 101, 109, 138, 1738, 10114, 19794, 1011090, 1019010, 1054130, 1091010, 34406858, 178858133, 565606858, 4289521091010, 55841058721258
Offset: 1

Views

Author

Giovanni Resta, May 10 2006

Keywords

Comments

Next term exceeds 1.4*10^16.

Links

Crossrefs

Cf. A000217, A119138. See A119034 for a table of cross-references.

A119141 Numbers k such that the k-th triangular number contains only digits {1,6,7}.

Original entry on oeis.org

1, 3, 11, 18, 36, 48, 58, 188, 351, 366, 576, 1111, 3941, 11106, 12423, 17981, 18263, 34976, 365423, 392711, 585963, 1111411, 1494106, 568817576, 1494099506, 3651623506, 12382820048, 351330663666, 586117934576, 37888432565023
Offset: 1

Views

Author

Giovanni Resta, May 10 2006

Keywords

Links

Crossrefs

Cf. A000217, A119140. See A119034 for a table of cross-references.

A119143 Numbers k such that the k-th triangular number contains only digits {1,6,8}.

Original entry on oeis.org

1, 3, 11, 36, 41, 483, 1541, 4041, 36908, 127958, 603136, 1110753, 1795333, 3518005633, 4046896633, 11055868678, 37045070336, 47289885136, 11563893709446, 193226234301588, 194000856277036, 351621434534041
Offset: 1

Views

Author

Giovanni Resta, May 10 2006

Keywords

Links

Crossrefs

Cf. A000217, A119142. See A119034 for a table of cross-references.

A119145 Numbers k such that the k-th triangular number contains only digits {1,6,9}.

Original entry on oeis.org

1, 3, 11, 13, 36, 1386, 1411, 1543, 438433, 445241, 5685366, 19849388, 36385963, 154671711, 199808366, 1408518133, 3497461911, 184180138433, 1350308625456, 4892835517288, 11505747426366, 118253893522536, 447137831091711
Offset: 1

Views

Author

Giovanni Resta, May 10 2006

Keywords

Links

Crossrefs

Cf. A000217, A119144. See A119034 for a table of cross-references.

A119147 Numbers k such that the k-th triangular number contains only digits {1,7,8}.

Original entry on oeis.org

1, 12, 18, 58, 132, 153, 1332, 1541, 6018, 11981, 13332, 40278, 124753, 133332, 603121, 1332507, 1333332, 13332507, 13333332, 19072906, 133332507, 133333332, 485569333, 486040907, 612880278, 1247972658, 1333332507
Offset: 1

Views

Author

Giovanni Resta, May 10 2006

Keywords

Links

Crossrefs

Cf. A000217, A119146. See A119034 for a table of cross-references.

A119149 Numbers k such that the k-th triangular number contains only digits {1,7,9}.

Original entry on oeis.org

1, 13, 18, 58, 586, 1258, 58613, 1350538, 1414213, 59517693, 1398413386, 5996665693, 119976657489461
Offset: 1

Views

Author

Giovanni Resta, May 10 2006

Keywords

Comments

Next term exceeds 1.4*10^16.

Links

Crossrefs

Cf. A000217, A119148. See A119034 for a table of cross-references.
Previous Showing 51-60 of 109 results. Next

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

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