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 A109758 #14 Feb 12 2023 11:45:27 %S A109758 5,6,10,13,20,22,23,24,27,29,33,40,41,43,46,51,54,79,80,83,85,93,106, %T A109758 111 %N A109758 Numbers k such that (10's complement factorial of k) - 1 is semiprime. %C A109758 Sequence possibly continues with 112, 137, 145, 148, 163, 165, 177, 190, 196, 197. 206 is the next certain term. - _Tyler Busby_, Feb 09 2023 %Y A109758 Cf. A110396, A109617. %K A109758 more,nonn,base %O A109758 1,1 %A A109758 _Jason Earls_, Aug 12 2005 %E A109758 More terms from _Sean A. Irvine_, Sep 18 2012