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 A058441 #15 Mar 09 2024 01:27:10
%S A058441 2,22,202,298,2002,2022,2202,20002,20022,22002,28998,200002,200022,
%T A058441 200202,202002,220002,632522,2000002,2000022,2000202,2020002,2020022,
%U A058441 2200002,2200202,20000002,20000022,20000202,20002002,20002022,20002202
%N A058441 Numbers k such that k^2 contains only digits {0,4,8}, not ending with zero.
%H A058441 Zhao Hui Du, <a href="/A058441/b058441.txt">Table of n, a(n) for n = 1..4000</a>
%H A058441 Patrick De Geest, <a href="http://www.worldofnumbers.com/threedigits.htm">Index to related sequences</a>
%H A058441 Hisanori Mishima, <a href="http://www.asahi-net.or.jp/~KC2H-MSM/mathland/math02/math0210.htm#048">Sporadic tridigital solutions</a>
%H A058441 Zhao Hui Du, <a href="https://github.com/emathgroup/selectedTopics/blob/master/data/all.048.out">All data no more than 30 digits</a>
%Y A058441 Cf. A058442.
%K A058441 nonn,base
%O A058441 1,1
%A A058441 _Patrick De Geest_, Nov 15 2000