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 A171420 #4 Mar 31 2012 14:00:56
%S A171420 5,7,8,12,13,16,21,22,25,26,31,35,40,41,43,49,52,59,62,63,68,69,78,81,
%T A171420 87,91,92,97,101,106,107,111,120,121,127,136,137,140,149,154,155,159,
%U A171420 165,166,170,171,177,185,195,199,206,210,215,218,229,235,239,240,245
%N A171420 Numbers n such that composite(n)={2 or 3}*{prime > 3}.
%Y A171420 Cf. A002808, A171156.
%K A171420 nonn
%O A171420 1,1
%A A171420 _Juri-Stepan Gerasimov_, Dec 08 2009
%E A171420 Two missing terms added by _D. S. McNeil_, Dec 10 2009