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 A058413 #16 Mar 09 2024 18:30:28
%S A058413 1,2,12,21,38,102,201,1002,1049,2001,10002,10679,20001,20348,100002,
%T A058413 100549,200001,202512,375501,643771,1000002,1020348,2000001,2002848,
%U A058413 10000002,10200201,20000001,20024988,20100102,100000002,100202001
%N A058413 Numbers k such that k^2 contains only digits {0,1,4}, not ending with zero.
%H A058413 Zhao Hui Du, <a href="/A058413/b058413.txt">Table of n, a(n) for n = 1..382</a>
%H A058413 Patrick De Geest, <a href="http://www.worldofnumbers.com/threedigits.htm">Index to related sequences</a>
%H A058413 Hisanori Mishima, <a href="http://www.asahi-net.or.jp/~KC2H-MSM/mathland/math02/math0210.htm#014">Sporadic tridigital solutions</a>
%t A058413 Select[Range[1, 10000], (ContainsOnly[#, {0, 1, 4}] && #[[-1]] != 0) &@ IntegerDigits[#^2] &] (* _Julien Kluge_, Jul 08 2016 *)
%Y A058413 Cf. A058414.
%K A058413 nonn,base
%O A058413 1,2
%A A058413 _Patrick De Geest_, Nov 15 2000