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.

A053949 Squares composed of digits {3,6,9}.

Original entry on oeis.org

9, 36, 3969, 69696, 93636, 3663396, 9696996, 966339396, 6693366969, 36333696996, 63396693369, 96693633936, 33993333636639339663936, 399339393339639693369636, 9936969933633699966996996, 396693636699939696999339663969, 6636966336636339969666396999936, 339666666363999366939366969366969936633336969
Offset: 1

Views

Author

Patrick De Geest, Mar 15 2000

Keywords

Crossrefs

Cf. A053948.

Formula

a(n) = A053948(n)^2. - Elmo R. Oliveira, Jul 18 2025

Extensions

a(13)-a(14) from C. Ronaldo (aga_new_ac(AT)hotmail.com), Jan 14 2005
a(15) from Jon E. Schoenfield, Sep 04 2006
a(16)-a(18) from Mishima's webpage added by Max Alekseyev, Jun 17 2011