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 A092292 #4 Feb 22 2013 14:39:00 %S A092292 0,4,8,10,14,15,20,21,25,28,32,33,38,39,43,45,49,53,56,57,61,63,67,71, %T A092292 73,77,78,82,86,87,92,93,97,99,103,107,110,111,115,117,121,125,127, %U A092292 131,132,135,139,143,145,149,150 %N A092292 a(n) = 3*n + A053838(n). %C A092292 This sequence has asymptotic density 1/3. %K A092292 easy,nonn %O A092292 0,2 %A A092292 _Philippe Deléham_, Feb 05 2004