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 A058445 #18 Aug 11 2024 14:41:33
%S A058445 2236081408416666
%N A058445 Numbers k such that k^2 contains only digits {0,5,6}, not ending with zero.
%C A058445 No more terms to 2 * 10^19. - _Charles R Greathouse IV_, Aug 20 2011
%H A058445 P. De Geest, <a href="https://www.worldofnumbers.com/threedigits.htm">Index to related sequences</a>
%H A058445 Tanya Khovanova, <a href="http://www.tanyakhovanova.com/RecursiveSequences/NonRecursions.html">Non Recursions</a>
%H A058445 Hisanori Mishima, <a href="http://www.asahi-net.or.jp/~KC2H-MSM/mathland/math02/math0210.htm">Sporadic tridigital solutions</a>
%H A058445 <a href="/index/O#oneterm">Index entries for one-term sequences</a>
%Y A058445 Cf. A058446.
%K A058445 nonn,base,hard,more,bref
%O A058445 1,1
%A A058445 _Patrick De Geest_, Nov 15 2000