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 A058449 #9 Aug 11 2024 14:41:33
%S A058449 26,8226,818576,8124474,26012881552428213576
%N A058449 Numbers k such that k^2 contains only digits {0,6,7}, not ending with zero.
%H A058449 P. De Geest, <a href="https://www.worldofnumbers.com/threedigits.htm">Index to related sequences</a>
%H A058449 Hisanori Mishima, <a href="http://www.asahi-net.or.jp/~KC2H-MSM/mathland/math02/math0210.htm#067">Sporadic tridigital solutions</a>
%Y A058449 Cf. A058450.
%K A058449 nonn,base,hard,more
%O A058449 1,1
%A A058449 _Patrick De Geest_, Nov 15 2000
%E A058449 One more term from Mishima's webpage added by _Max Alekseyev_, Jul 27 2009