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 A158717 #4 Mar 31 2012 10:26:14 %S A158717 0,149,1069,0,108649 %N A158717 Smallest emirp with n distinct nonprime digits (or 0, if no such number exists). %Y A158717 A006567, A031991 %K A158717 fini,full,nonn,base %O A158717 2,2 %A A158717 _Lekraj Beedassy_, Mar 24 2009