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 A025505 #5 Mar 30 2012 18:35:25 %S A025505 2,5,7,8,10,11,14,17,18,20,23,25,26,29,32,34,35,37,38,41,43,44,46,49, %T A025505 52,53,55,56,59,61,62,64,65,68,71,73,74,76,79,80,82,83,86,88,89,91,92, %U A025505 95,98,99,101,104,106,107,109,110,113,116,118,119,122,125,126,128,131,134,135 %N A025505 Index of n-th 2 in A006928. %K A025505 nonn %O A025505 1,1 %A A025505 _David W. Wilson_