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.

A119140 Triangular numbers composed of digits {1,6,7}.

Original entry on oeis.org

1, 6, 66, 171, 666, 1176, 1711, 17766, 61776, 67161, 166176, 617716, 7767711, 61677171, 77171676, 161667171, 166777716, 611677776, 66767167176, 77111161116, 171676611666, 617617761166, 1116177116671, 161776717667666676, 1116166667661771771, 6667177116611677771
Offset: 1

Views

Author

Giovanni Resta, May 10 2006

Keywords

Links

Crossrefs

Cf. A000217, A053907, A119141. See A119033 for a table of cross-references.

Formula

a(n) = A000217(A119141(n)). - Michel Marcus, Mar 22 2023

Extensions

a(24)-a(26) from Tyler Busby, Mar 22 2023

A053906 Numbers k such that k^2 contains only digits {1,6,7}.

Original entry on oeis.org

1, 4, 26, 131, 276, 881, 3431, 81346, 81619, 129119, 132954, 1292931424
Offset: 1

Views

Author

Patrick De Geest, Mar 15 2000

Keywords

Links

Crossrefs

Cf. A053907.

Extensions

More terms from C. Ronaldo (aga_new_ac(AT)hotmail.com), Jan 04 2005
Showing 1-2 of 2 results.

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

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