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 A038004 #3 Mar 30 2012 17:37:05 %S A038004 2,7,5,13,25,37,41,89,61,85,113,221,253,281,181,361,421,433,761,841, %T A038004 613,793,1009,1541,1201,1901,1121,1261,2801,2881,2053,3173,2773,2521, %U A038004 2161,3421,4001,6865,5581,6553,5441,6481,7141,10193 %N A038004 Least k such that A033178(k)=n. %K A038004 nonn %O A038004 1,1 %A A038004 _Christian G. Bower_