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 A356671 #9 Oct 13 2022 10:58:37 %S A356671 2,7,8,10,14,18,22 %N A356671 Positive integers k such that A356670(k) = k. %Y A356671 Cf. A356670. %K A356671 nonn,more %O A356671 1,1 %A A356671 _Stefano Spezia_, Aug 22 2022 %E A356671 a(7) from _Stefano Spezia_, Oct 13 2022