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

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

Offset

1,1

Links

Zhao Hui Du, Table of n, a(n) for n = 1..19

Patrick De Geest, Squares containing at most three distinct digits, Index entries for related sequences.

Hisanori Mishima, Sporadic tridigital solutions.

Author?, Source, (txt)

Formula

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

Crossrefs

Cf. A053948.

Sequence in context: A246757 A079655 A203764 * A071134 A116108 A232257

Adjacent sequences: A053946 A053947 A053948 * A053950 A053951 A053952

Keyword

nonn,base

Author

Patrick De Geest, Mar 15 2000

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

Status

approved