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 A058431 #8 Aug 11 2024 14:41:33
%S A058431 6,1740871344,25107103902348156
%N A058431 Numbers k such that k^2 contains only digits {0,3,6}, not ending with zero.
%H A058431 P. De Geest, <a href="https://www.worldofnumbers.com/threedigits.htm">Index to related sequences</a>
%H A058431 Hisanori Mishima, <a href="http://www.asahi-net.or.jp/~KC2H-MSM/mathland/math02/math0210.htm#036">Sporadic tridigital solutions</a>
%Y A058431 Cf. A058432.
%K A058431 nonn,base,hard,more,bref
%O A058431 1,1
%A A058431 _Patrick De Geest_, Nov 15 2000