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.

Showing 1-2 of 2 results.

A119146 Triangular numbers composed of digits {1,7,8}.

Original entry on oeis.org

1, 78, 171, 1711, 8778, 11781, 887778, 1188111, 18111171, 71778171, 88877778, 811178781, 7781717881, 8888777778, 181877771881, 887788118778, 888887777778, 88877878118778, 88888877777778, 181887881178871, 8888778778118778, 8888888777777778, 117888788817817111
Offset: 1

Views

Author

Giovanni Resta, May 10 2006

Keywords

Links

Crossrefs

Cf. A000217, A053913, A119147. See A119033 for a table of cross-references.

Formula

a(n) = A000217(A119147(n)). - Tyler Busby, Mar 31 2023

Extensions

a(21)-a(23) from Tyler Busby, Mar 22 2023

A053912 Numbers k such that k^2 contains only digits {1,7,8}.

Original entry on oeis.org

1, 9, 109, 280859, 105769141, 279067891
Offset: 1

Views

Author

Patrick De Geest, Mar 15 2000

Keywords

Links

Crossrefs

Cf. A053913.
Showing 1-2 of 2 results.

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

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