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 A080919 #3 Mar 30 2012 16:49:42 %S A080919 2,3,4,5,7,8,9,10,12,13,14,15,17,18,20,22,23,25,26,27,28,30,31,32,33, %T A080919 35,36,38,40,41,43,44,45,46,48,49,50,51,53,54,56,58,59,61,62,64,67,69, %U A080919 70,72,73,75,77,78,80,81,82,83,85,86,87,88,90,91,93,95,96,98,99,100,101,103,104 %N A080919 Numbers that do not appear in A080900. %Y A080919 Complement of A080914. %K A080919 nonn %O A080919 1,1 %A A080919 _N. J. A. Sloane_, Apr 04 2003