A053957 Squares composed of digits {4,6,7}.
4, 64, 676, 7744, 4444667464644, 66667767777644764644, 767646664777467676766464, 6446477674444767467664676, 7446477664767776477464446664464, 64446474444746646444646744666444644, 664676644466466777446466766667744446667647467664
Offset: 1
Links
- Patrick De Geest, Squares containing at most three distinct digits, Index entries for related sequences.
- Hisanori Mishima, Squares consisted of 3 different digits.
- Author?, Source(txt)
Crossrefs
Cf. A053956.
Formula
a(n) = A053956(n)^2. - Elmo R. Oliveira, Jul 17 2025
Extensions
a(6)-a(7) from C. Ronaldo (aga_new_ac(AT)hotmail.com), Jan 04 2005
a(8) from Jon E. Schoenfield, Sep 04 2006
a(9)-a(10) from Mishima's website added by Max Alekseyev, May 07 2009
a(11) from Mishima's website added by Elmo R. Oliveira, Jul 17 2025