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 A130176 #12 Aug 30 2015 11:44:39 %S A130176 2,3,4,5,6,8,9,10,11,12,15,16,18,20,22,23,24,25,27,29,30,32,33,36,40, %T A130176 41,44,45,46,48,50,53,54,55,58,60,64,66,69,72,75,77,80,81,82,83,87,88, %U A130176 89,90,92,96,99,100,106,108,110,113,115,116,120,121,123,125,128,131,132 %N A130176 Numbers n with property that the largest prime factor is a Sophie Germain prime. %C A130176 Prime terms 2,3,5,11,23,29,... are in A005384. %C A130176 A156541 is a subsequence. [_Reinhard Zumkeller_, Feb 10 2009] %C A130176 A156660(A006530(a(n))) = 1. [_Reinhard Zumkeller_, Dec 03 2009] %t A130176 Select[Range[2, 132], PrimeQ[FactorInteger[#][[-1, 1]]*2 + 1] &] (* _Ivan Neretin_, Aug 30 2015 *) %Y A130176 Cf. A005384. %K A130176 nonn %O A130176 1,1 %A A130176 _Zak Seidov_, May 14 2007