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 A168250 #2 Mar 30 2012 17:26:30 %S A168250 17,13,17,13,17,17,17,17,31,17,17,17,17,17,13,17,17,17,13,17,17,31,31, %T A168250 31,13,17,13,17,17,17,17,31,13,13,17,13,17,17,13,17,31,31,31,17,17,31, %U A168250 13,17,31,17,17,13,37,31,17,31,17,31,31,13,31,13,17,17,31,37,31,17,31 %N A168250 a(n) = sum of digits of A168174(n). %Y A168250 Cf. A006567, A168174, A168248. %K A168250 base,nonn %O A168250 1,1 %A A168250 _Zak Seidov_, Nov 21 2009