A053951 Squares composed of digits {4,5,7}.
4, 7744, 47444544, 47775744, 57577744, 4755757444, 44547775545744, 7557757477754457744, 55744775754747577744, 74474545477575775744575745574544, 747554745554544455555455747745774457774554454557445577744
Offset: 1
Links
- Author?, Source(txt)
- Patrick De Geest, Squares containing at most three distinct digits, Index entries for related sequences
- H. Mishima, Sporadic tridigital solutions
Crossrefs
Cf. A053950.
Formula
a(n) = A053950(n)^2.
Extensions
More terms from C. Ronaldo (aga_new_ac(AT)hotmail.com), Jan 04 2005
One more term from Mishima's webpage added by Max Alekseyev, Jan 28 2012
a(11) from Zhao Hui Du, Mar 10 2024