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 A138887 #4 Mar 30 2012 18:51:00 %S A138887 0,1,4,6,7,8,9,10,12,13,14,15,16,17,18,19,20,21,22,24,25,26,27,28,30, %T A138887 31,32,33,34,35,36,37,38,39,40,42,43,44,45,46,47,48,49,50,51,52,54,55, %U A138887 56,57,58,59,60,61,62,63,64,65,66,67,68 %N A138887 Numbers that are not Sophie Germain primes. %C A138887 Nonnegative integers that are not in A005384. %C A138887 A156660(a(n)) = 0; A053176 is a subsequence. [From _Reinhard Zumkeller_, Feb 18 2009] %Y A138887 Cf. A001690, A005384, A053176, A062289, A138888, A138889, A138890, A138891. %K A138887 easy,nonn %O A138887 0,3 %A A138887 _Omar E. Pol_, Apr 05 2008