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 A165947 #13 Apr 19 2016 10:24:29
%S A165947 11,19,23,31,43,47,53,59,67,71,73,79,83,101,103,107,113,127,131,139,
%T A165947 151,157,163,167,173,179,191,193,199,211,223,227,233,239,241,251,263,
%U A165947 269,271,283,293,307,311,313,331,347,353,359,367,373,379,383,409,419,421
%N A165947 Primes of the form 2q + 3 where q is composite.
%H A165947 G. C. Greubel, <a href="/A165947/b165947.txt">Table of n, a(n) for n = 1..2500</a>
%F A165947 A000040 \ { {2,3,5} U A089531}. - _R. J. Mathar_, Oct 28 2009
%t A165947 Select[Table[If[PrimeQ[n],0,2n+3],{n,2,500}],PrimeQ] (* _Harvey P. Dale_, Mar 25 2011 *)
%o A165947 (PARI) lista(nn) = forcomposite(q=4, nn, if(isprime(p=2*q+3), print1(p, ", "))); \\ _Altug Alkan_, Apr 18 2016
%Y A165947 Cf. A002808, A129069.
%K A165947 nonn,easy
%O A165947 1,1
%A A165947 _Claudio Meller_, Oct 01 2009