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 A058462 #10 Jul 17 2025 08:20:32
%S A058462 676,276676,2677627662267622276,262277276277222276677776,
%T A058462 22672277676226226672276776667627776
%N A058462 Squares composed of digits {2,6,7}.
%H A058462 Patrick De Geest, <a href="https://www.worldofnumbers.com/threedigits.htm">Index to related sequences</a>.
%H A058462 Hisanori Mishima, <a href="https://www.asahi-net.or.jp/~KC2H-MSM/mathland/math02/math0210.htm#267">Sporadic tridigital solutions</a>.
%F A058462 a(n) = A058461(n)^2. - _Elmo R. Oliveira_, Jul 16 2025
%Y A058462 Cf. A058461.
%K A058462 nonn,base,hard,more
%O A058462 1,1
%A A058462 _Patrick De Geest_, Nov 15 2000
%E A058462 a(5) from Mishima's website added by _Elmo R. Oliveira_, Jul 16 2025