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 A174786 #11 Nov 21 2013 12:50:01
%S A174786 3,9,15,21,39,45,51,81,99,105,129,165,171,189,225,231,249,255,261,309,
%T A174786 345,351,381,441,459,501,555,561,585,591,639,645,651,675,819,855,879,
%U A174786 939,945,969,975,1011,1089,1095,1101,1179,1185,1215,1221,1275,1281,1299,1359,1365
%N A174786 Numbers n congruent to 3 (mod 6) such that n+2 and n+8 are primes.
%H A174786 Vincenzo Librandi, <a href="/A174786/b174786.txt">Table of n, a(n) for n = 1..1000</a>
%t A174786 Select[6Range[230]-3,And@@PrimeQ[{#+2,#+8}]&] (* _Harvey P. Dale_, Aug 21 2011 *)
%Y A174786 Cf. A016945, A023201.
%K A174786 nonn,easy
%O A174786 1,1
%A A174786 _Giovanni Teofilatto_, Mar 29 2010
%E A174786 Definition corrected and sequence extended - _R. J. Mathar_, Mar 30 2010