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 A058427 #13 Jul 17 2025 08:20:27
%S A058427 3,47,173,547,1703,538703,1731828227423,94916921673747,
%T A058427 96385117673990673,151400161921673747,149067065510873088673
%N A058427 Numbers k such that k^2 contains only digits {0,2,9}, not ending with zero.
%H A058427 Patrick De Geest, <a href="https://www.worldofnumbers.com/threedigits.htm">Index to related sequences</a>.
%H A058427 Hisanori Mishima, <a href="https://www.asahi-net.or.jp/~KC2H-MSM/mathland/math02/math0210.htm#029">Sporadic tridigital solutions</a>.
%Y A058427 Cf. A058428.
%K A058427 nonn,base,hard,more
%O A058427 1,1
%A A058427 _Patrick De Geest_, Nov 15 2000
%E A058427 a(10) from Herman Jamke (hermanjamke(AT)fastmail.fm), Mar 30 2008
%E A058427 a(11) from Mishima's website added by _Elmo R. Oliveira_, Jul 16 2025