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 A158813 #3 Mar 31 2012 10:26:14 %S A158813 7,13,17,19,23,13,29,31,17,19,37,41,17,23,43,19,47,7,19,53,29,23,31, %T A158813 59,61,23,67,37,29,71,73,31,23,41,29,79,43,83,31,47,89,37,13,29,97,53, %U A158813 41,37,101,31,103,43,107,109,59,41,113,61,47,43,17,29,37,67,127,47,31,53 %N A158813 Largest prime factor of entries in A158725(n). %K A158813 nonn %O A158813 1,1 %A A158813 _Lekraj Beedassy_, Mar 27 2009 %E A158813 Extended by _Ray Chandler_, Mar 28 2009