A053931 Squares composed of digits {2,6,9}.
9, 29929, 69696, 929296, 9696996, 996222969, 26629996969, 69926926969, 269996262622969, 9222222699262629962929, 9929662926692269969296, 96296299962926222299669929, 2669292996662992629666262969, 2699929699222292222296696996, 62969966996922666266229669292996
Offset: 1
References
- Clifford A. Pickover, The Mathematics of Oz, Chapter 9, "Square Overdrive", page 250, Cambridge University Press 2002.
Links
- Zhao Hui Du, Table of n, a(n) for n = 1..18
- Joe K. Crump, TriDigital Squares.
- Patrick De Geest, Squares containing at most three distinct digits, Index entries for related sequences.
- Hisanori Mishima, Sporadic tridigital solutions.
Crossrefs
Cf. A053930.
Formula
a(n) = A053930(n)^2. - Elmo R. Oliveira, Jul 17 2025
Extensions
More terms from Joe K. Crump (joecr(AT)carolina.rr.com), Sep 07 2000
a(14) onwards added by Zhao Hui Du, Mar 01 2024