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 A164858 #7 Mar 11 2014 01:32:46 %S A164858 1,2,3,2,5,3,7,2,5,13,13,3,19,7,5,2,23,3,31,7,37,37,37,3,43,43,43,43, %T A164858 43,5,53,2,61,61,7,3,61,73,73,73,73,79,79,83,83,83,83,3,89,89,89,89, %U A164858 89,3,103,103,103,103,103,5,113,113,13,2,113,113,113,131,131,131,131,3,139 %N A164858 a(n) = largest prime dividing A164857(n). a(1)=1. %C A164858 A164857(n) is divisible by every prime from 2 to A164858(n). %Y A164858 Cf. A055932, A164798, A164799, A164857. %K A164858 nonn %O A164858 1,2 %A A164858 _Leroy Quet_, Aug 28 2009 %E A164858 Extended by _Ray Chandler_, Mar 14 2010