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 A117913 #2 Mar 30 2012 17:36:44 %S A117913 1,3,5,7,9,15,135,175,315,735,1395,1935,3195,3915,9135,9315 %N A117913 Lynch-Bell numbers whose digits are all odd. %C A117913 Equivalently, the odd Lynch-Bell numbers. %Y A117913 Cf. A115569, A117912 (same but digits are all even). %K A117913 base,easy,fini,full,nonn %O A117913 1,2 %A A117913 _Rick L. Shepherd_, Apr 02 2006