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 A175969 #2 Mar 30 2012 19:00:24 %S A175969 2,4,5,7,8,9,10,12,13,14,15,16,17,19,20,21,22,23,24,25,26,27,28,30,31, %T A175969 32,33,34,35,36,37,38,39,40,41,43,44,45,46,47,48,49,50,51,52,53,54,55, %U A175969 56,57,58,60,61,62,63,64,65,66,67,68,69,70 %N A175969 Complement of A014284(n), where A014284(n) = the lexicographically earliest sequence with first differences as increasing sequence of primes A000040. %Y A175969 Cf. A175965, A175966, A175967, A175968, A014284, A051349, A175970. %K A175969 nonn %O A175969 1,1 %A A175969 _Jaroslav Krizek_, Oct 31 2010