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 A058461 #8 Aug 11 2024 14:41:33
%S A058461 26,526,1636345826,512130136076,150573163864701424
%N A058461 Numbers k such that k^2 contains only digits {2,6,7}.
%H A058461 P. De Geest, <a href="https://www.worldofnumbers.com/threedigits.htm">Index to related sequences</a>
%H A058461 Hisanori Mishima, <a href="http://www.asahi-net.or.jp/~KC2H-MSM/mathland/math02/math0210.htm#267">Sporadic tridigital solutions</a>
%Y A058461 Cf. A058462.
%K A058461 nonn,base,hard,more
%O A058461 1,1
%A A058461 _Patrick De Geest_, Nov 15 2000
%E A058461 a(5) (from the Mishima web site) added by _Max Alekseyev_, Jan 11 2007