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.

A053972 Numbers k such that k^2 contains only digits {6,7,9}.

Original entry on oeis.org

3, 26, 264, 313, 3114, 3114113, 278922387, 881361264, 2603208937, 3125343176, 312518799063, 2770739969214, 8366461419063, 260723947264113, 9831977256725526
Offset: 1

Views

Author

Patrick De Geest, Mar 15 2000

Keywords

Crossrefs

Cf. A053973.

Extensions

More terms from C. Ronaldo (aga_new_ac(AT)hotmail.com), Jan 14 2005
Two more terms from Jon E. Schoenfield, Sep 04 2006
a(14)-a(15) from Mishima's website, added by Max Alekseyev, Nov 30 2017

A119232 Triangular numbers composed of digits {6,7,9}.

Original entry on oeis.org

6, 66, 666, 677766969666676, 66799696699976679697696799766996696
Offset: 1

Views

Author

Giovanni Resta, May 10 2006

Keywords

Comments

a(6) > 10^40. - Tyler Busby, Mar 29 2023

Crossrefs

Cf. A000217, A053973, A119233. See A119033 for a table of cross-references.

Formula

a(n) = A000217(A119233(n)). - Michel Marcus, Mar 27 2023

Extensions

a(5) from Max Alekseyev, Mar 10 2009
Showing 1-2 of 2 results.