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.
%I A137004 #7 Apr 12 2024 09:51:27 %S A137004 1,5,11,15,16,25,26,75,76,125,165,166,275,276,511,515,516,525,526,715, %T A137004 716,725,1125,1275,1665,1666,2261,2275,2675,5125,5165,7261,7525,11215, %U A137004 11275,12511,12515,12715,16665,16666,25525,25526,25715,25725,26675,26761,27525,51211,72261,72576,125125,125165,125166,125525,125526,127525,161761,165125 %N A137004 Numbers k such that k and k^2 use only the digits 1, 2, 5, 6 and 7. %C A137004 Generated with DrScheme. %C A137004 Subsequence of A137005 and A137006. - _M. F. Hasler_, Jan 24 2008 %H A137004 Jonathan Wellons, <a href="/A137004/b137004.txt">Table of n, a(n) for n = 1..774</a> %H A137004 J. Wellons, <a href="https://web.archive.org/web/20090206165028/http://jonathanwellons.com/shared-digits/">Tables of Shared Digits</a> [archived] %e A137004 756156171512576^2 = 571772155716556252275726155776. %K A137004 base,nonn %O A137004 1,2 %A A137004 Jonathan Wellons (wellons(AT)gmail.com), Jan 22 2008