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 A175284 #2 Mar 30 2012 17:26:31
%S A175284 7,37,163,709,877,46447,67867,81517,118687,238639,292147,331207,
%T A175284 430999,497737,548347,628063,1120429,1412539,1462897,1655089,1680919,
%U A175284 1955809,2642257,3205897,3358063,3394813,3781087,4654813,4715419,4745869
%N A175284 Primes p of the form p=n^2+3n+9 such that q=p^2+3p+9 is also prime.
%C A175284 Intersection of A175283 and A005471.
%t A175284 Reap[Do[If[PrimeQ[p=n^2+3n+9]&&PrimeQ[q=p^2+3p+9],Sow[p]],{n,-1,10^4}]][[2,1]]
%Y A175284 Cf. A005471, A175281-3.
%K A175284 nonn
%O A175284 1,1
%A A175284 _Zak Seidov_, Mar 21 2010