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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A119112 Numbers k such that the k-th triangular number contains only digits {1,3,4}.

Original entry on oeis.org

1, 2, 53, 258, 25746, 53746, 161946, 7930238, 14927378, 29810546, 4714751561, 25742623453, 94268917816334704578
Offset: 1

Views

Author

Giovanni Resta, May 10 2006

Keywords

Links

Crossrefs

Cf. A000217, A119111. See A119034 for a table of cross-references.

Programs

  • Mathematica
    (Sqrt[8#+1]-1)/2&/@Table[Select[FromDigits/@Tuples[{1,3,4},n],OddQ[ Sqrt[ 8#+1]]&],{n,21}]//Flatten (* Harvey P. Dale, Jul 09 2017 *)

Extensions

a(13) from Tyler Busby, Mar 30 2023

A119114 Numbers k such that the k-th triangular number contains only digits {1,3,5}.

Original entry on oeis.org

1, 2, 5, 10, 17, 26, 101, 257, 266, 2657, 2666, 8382, 10114, 10130, 26657, 26666, 55733, 101342, 103453, 176257, 266657, 266666, 553778, 557342, 794142, 843010, 1645085, 2666657, 2666666, 3209770, 4723421, 26666657, 26666666, 84042269
Offset: 1

Views

Author

Giovanni Resta, May 10 2006

Keywords

Links

Crossrefs

Cf. A000217, A119113. See A119034 for a table of cross-references.

A119116 Numbers k such that the k-th triangular number contains only digits {1,3,6}.

Original entry on oeis.org

1, 2, 3, 8, 11, 16, 36, 163, 816, 115166, 475633, 1151836, 5677378, 35585421, 35598136, 51596833, 258114833, 1152095166, 11060118546, 112366468411, 1797838514253, 11234888843541, 78909614580621, 1632858433307288
Offset: 1

Views

Author

Giovanni Resta, May 10 2006

Keywords

Links

Crossrefs

Cf. A000217, A119115. See A119034 for a table of cross-references.

A119118 Numbers k such that the k-th triangular number contains only digits {1,3,7}.

Original entry on oeis.org

1, 2, 18, 58, 1853, 5853, 1620578, 485216058, 1243473981, 2747265466, 595277030253, 789599540493, 2573455929746, 48450258487106
Offset: 1

Views

Author

Giovanni Resta, May 10 2006

Keywords

Comments

Next term is greater than 4.4*10^18. - Max Alekseyev, Oct 15 2012

Links

Crossrefs

Cf. A000217, A119117. See A119034 for a table of cross-references.

A119120 Numbers k such that the k-th triangular number contains only digits {1,3,8}.

Original entry on oeis.org

1, 2, 421, 1541, 8753, 150421, 12914246, 1327696379533, 4034385661121, 605166395826533, 16360402306368458, 249752330575267378
Offset: 1

Views

Author

Giovanni Resta, May 10 2006

Keywords

Comments

Next term exceeds 4.4*10^18.

Links

Crossrefs

Cf. A000217, A119119. See A119034 for a table of cross-references.

Extensions

Two more terms from Max Alekseyev, May 12 2009

A119122 Numbers k such that the k-th triangular number contains only digits {1,3,9}.

Original entry on oeis.org

1, 2, 13, 621, 4458, 489884458, 632318261, 893464178, 16684802253, 1621069592578, 2502478528946, 250255842662341, 1543458022195053, 527851115257700546
Offset: 1

Views

Author

Giovanni Resta, May 10 2006

Keywords

Links

Crossrefs

Cf. A000217, A119121. See A119034 for a table of cross-references.

Extensions

a(14) from Max Alekseyev, Oct 14 2012

A119124 Numbers k such that the k-th triangular number contains only digits {1,4,5}.

Original entry on oeis.org

1, 5, 9, 10, 101, 298, 301, 1761, 10113, 10114, 15133, 91010, 297134, 3329010, 10406301, 15133698, 30180826, 47989885, 101434130, 301468258, 942805541, 9544151561, 16977369885, 95335633898
Offset: 1

Views

Author

Giovanni Resta, May 10 2006

Keywords

Comments

Next term exceeds 1.4*10^16.

Links

Crossrefs

Cf. A000217, A119123. See A119034 for a table of cross-references.

A119126 Numbers k such that the k-th triangular number contains only digits {1,4,6}.

Original entry on oeis.org

1, 3, 11, 36, 113, 288, 541, 963, 1711, 2868, 5313, 36458, 48258, 182463, 288588, 363633, 536956, 568588, 1711411, 2988113, 9425088, 11055868, 30533313, 47257686, 48200963, 963446588, 1527359886, 1825604911, 363633363333
Offset: 1

Views

Author

Giovanni Resta, May 10 2006

Keywords

Links

Crossrefs

Cf. A000217, A119125. See A119034 for a table of cross-references.

A119127 Numbers k such that the k-th triangular number contains only digits {1,4,7}.

Original entry on oeis.org

1, 18, 38, 58, 15306, 28893, 3851686, 595216169886, 53248694146381, 536869582203620058, 14927275335718688666
Offset: 1

Views

Author

Giovanni Resta, May 10 2006

Keywords

Links

Crossrefs

Cf. A000217, A079654. See A119034 for a table of cross-references.

Extensions

a(10)-a(11) from Tyler Busby, Mar 31 2023

A119129 Numbers k such that the k-th triangular number contains only digits {1,4,8}.

Original entry on oeis.org

1, 478, 1541, 4866, 988113, 4216353, 15155321, 16977521, 983990258, 531956543121, 544826911685686, 16843306612090658, 127392946577229686
Offset: 1

Views

Author

Giovanni Resta, May 10 2006

Keywords

Comments

Next term exceeds 1.4*10^20.

Links

Crossrefs

Cf. A000217, A119128. See A119034 for a table of cross-references.

Extensions

a(12)-a(13) from Max Alekseyev, Aug 16 2013
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Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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