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 A058426 #15 Jul 16 2025 08:16:40
%S A058426 25,225,2025,55225,255025,555025,2002225,2205225,20205025,25050025,
%T A058426 255520225,2500500025,5255525025,220200255025,250005000025,
%U A058426 250505255025,2552022225025,2555250205225,20025222252025,25000050000025,25005050255025,25502550500025,50200555005225
%N A058426 Squares composed of digits {0,2,5}, not ending with zero.
%H A058426 Zhao Hui Du, <a href="/A058426/b058426.txt">Table of n, a(n) for n = 1..5913</a>
%H A058426 Patrick De Geest, <a href="http://www.worldofnumbers.com/threedigits.htm">Index to related sequences</a>.
%H A058426 Hisanori Mishima, <a href="https://www.asahi-net.or.jp/~KC2H-MSM/mathland/math02/math0210.htm#025">Sporadic tridigital solutions</a>.
%F A058426 a(n) = A058425(n)^2. - _Elmo R. Oliveira_, Jul 16 2025
%Y A058426 Cf. A058425.
%K A058426 nonn,base
%O A058426 1,1
%A A058426 _Patrick De Geest_, Nov 15 2000