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 A058438 #13 Oct 18 2024 14:36:08
%S A058438 4,64,440664064,466646404,46400606464,640060004606400004,
%T A058438 446060064064060664464,666460646444644406404,6404064646440406400064,
%U A058438 64004064064644004064000064,666444044666640606004460644,64600604644004446466060040004,64640004404460064604400600064
%N A058438 Squares composed of digits {0,4,6}, not ending with zero.
%C A058438 Includes all numbers of the form (8*100^k + 254*10^k + 8)^2 for k >= 5.
%H A058438 Zhao Hui Du, <a href="/A058438/b058438.txt">Table of n, a(n) for n = 1..25</a>
%H A058438 Patrick De Geest, <a href="http://www.worldofnumbers.com/threedigits.htm">Index to related sequences</a>
%H A058438 Hisanori Mishima, <a href="http://www.asahi-net.or.jp/~KC2H-MSM/mathland/math02/math0210.htm#046">Sporadic tridigital solutions</a>
%F A058438 a(n) = A058437(n)^2. - _Andrew Howroyd_, Oct 18 2024
%Y A058438 Cf. A058437.
%K A058438 nonn,base
%O A058438 1,1
%A A058438 _Patrick De Geest_, Nov 15 2000