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 A158812 #3 Mar 31 2012 10:26:14 %S A158812 7,7,7,7,7,13,7,7,13,13,7,7,17,13,7,17,7,7,19,7,13,17,13,7,7,19,7,13, %T A158812 17,7,7,17,23,13,19,7,13,7,19,13,7,17,7,23,7,13,17,19,7,23,7,17,7,7, %U A158812 13,19,7,13,17,19,7,29,23,13,7,19,29,17,7,13,7,23,13,7,31,7,23,17,19,13,17,7 %N A158812 Smallest prime factor of entries in A158725(n). %K A158812 nonn %O A158812 1,1 %A A158812 _Lekraj Beedassy_, Mar 27 2009 %E A158812 Extended by _Ray Chandler_, Mar 28 2009