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 A058457 #12 Mar 09 2024 18:39:22
%S A058457 6,14945311394,179619783606,2514602599284156,
%T A058457 251462176552105392823457806
%N A058457 Numbers k such that k^2 contains only digits {2,3,6}.
%H A058457 Patrick De Geest, <a href="http://www.worldofnumbers.com/threedigits.htm">Index to related sequences</a>
%H A058457 Hisanori Mishima, <a href="http://www.asahi-net.or.jp/~KC2H-MSM/mathland/math02/math0210.htm#236">Sporadic tridigital solutions</a>
%Y A058457 Cf. A058458.
%K A058457 nonn,base,hard,more
%O A058457 1,1
%A A058457 _Patrick De Geest_, Nov 15 2000
%E A058457 a(5) from _Zhao Hui Du_, Mar 09 2024