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 A173905 #7 Mar 30 2012 18:52:39
%S A173905 0,1,2,3,4,6,8,9,10,12,14,15,16,18,20,21,22,24,25,26,27,28,30,32,33,
%T A173905 34,35,36,38,39,40,42,44,45,46,48,49,50,51,52,54,55,56,57,58,60,62,63,
%U A173905 64,65,66,68,69,70,72,74,75,76,77,78,80,81,82,84,85,86,87,88,90,91,92,93
%N A173905 {2,3} and the nonprimes A141468.
%C A173905 Essentially the same as A002808, A141468, A018252, A065090, A171581 and A056653.
%Y A173905 Cf. A141468.
%K A173905 nonn,less
%O A173905 1,3
%A A173905 _Juri-Stepan Gerasimov_, Mar 02 2010
%E A173905 Replaced the 4-fold negation in the definition by a simpler phrase - _R. J. Mathar_, Mar 05 2010