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 A181570 #7 Mar 30 2012 18:40:58
%S A181570 7,13,17,23,31,37,41,53,67,89,97,103,109,113,127,137,149,151,163,167,
%T A181570 179,197,211,223,227,229,241,263,269,277,281,283,311,331,347,359,367,
%U A181570 373,383,389,397,419,431,433,439,479,491,503,509,541,547,587,601,617,619,653,673,677,683,691,709
%N A181570 Primes in A050798.
%C A181570 Primes p such that p^2 + 1 is expressible as the sum of two nonzero squares in exactly two ways.
%F A181570 A050798 INTERSECTION A000040. {p in A000040 such that A000161(p^2 + 1) = 2}.
%Y A181570 Cf. A000040, A000161, A050798.
%K A181570 nonn,easy
%O A181570 1,1
%A A181570 _Jonathan Vos Post_, Jan 29 2011