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 A058451 #10 Aug 11 2024 14:41:33
%S A058451 3,264,813,3114,81240813,262861353,30000101109940614,
%T A058451 24691314243454114014126412353
%N A058451 Numbers k such that k^2 contains only digits {0,6,9}, not ending with zero.
%H A058451 P. De Geest, <a href="https://www.worldofnumbers.com/threedigits.htm">Index to related sequences</a>
%H A058451 Hisanori Mishima, <a href="http://www.asahi-net.or.jp/~KC2H-MSM/mathland/math02/math0210.htm#069">Sporadic tridigital solutions</a>
%Y A058451 Cf. A058452.
%K A058451 nonn,base,more
%O A058451 1,1
%A A058451 _Patrick De Geest_, Nov 15 2000
%E A058451 a(8) from _Zhao Hui Du_, Mar 08 2024