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 A338457 #8 Oct 29 2020 03:23:35 %S A338457 1,2,15,27,354,893,2127,2133,2427,2649,4098,4107,6189,19721,124064, %T A338457 140287,1200685,17347808,18209035,32738176,35033632 %N A338457 Numbers k such that A338338(k) = k. %H A338457 Rémy Sigrist, <a href="/A338457/a338457.txt">C program for A338457</a> %o A338457 (C) See Links section. %Y A338457 Cf. A280754, A338338. %K A338457 nonn,more %O A338457 1,2 %A A338457 _Rémy Sigrist_, Oct 28 2020