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 A130006 #2 Sep 24 2013 09:24:40 %S A130006 2,3,3,5,5,7,11,11,11,17,19,23,17,23,29,29,37,31,43,43,29,47,47,43,53, %T A130006 59,67,41,71,71,59,71,83,71,97,83,59,79,89,83,107,113,71,107,127,103, %U A130006 131,157,137,173,179,131,167,101,179,193,139,167,179,107,191,197,173 %N A130006 Prime numbers arising from A050704. %F A130006 a(n)=A050704(n) - (prime factors of A050704(n)). %e A130006 a(10)=17 because A050704(10) - prime factors of A050704(10) = 28-(7+2+2)=28-11=17. %Y A130006 Cf. A050704. %K A130006 easy,nonn %O A130006 1,1 %A A130006 _Tomas Xordan_, Jun 15 2007