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 A045647 #17 Aug 08 2025 03:24:54 %S A045647 1,2,4,792,51648,53824,95328,6460672,54468608,59854592,7236791296 %N A045647 Numbers k such that k! stripped of trailing zeros ends in k. %H A045647 <a href="/index/Fa#factorial">Index entries for sequences related to factorial numbers</a>. %Y A045647 Cf. A000142, A004154. %K A045647 base,nonn,more %O A045647 1,2 %A A045647 _David W. Wilson_ %E A045647 a(8)-a(10) from _Robert Gerbicz_, May 08 2008 %E A045647 a(11) from _Amiram Eldar_, Aug 08 2025