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 A225590 #25 May 16 2013 12:56:58 %S A225590 2,11,17,23,53,61,67,139,149,151,163,251,263,269,281,397,421,431,541, %T A225590 547,557,607,619,743,773,809,1021,1039,1229,1279,1291,1303,1361,1553, %U A225590 1601,1619,1637,1871,1901,1949,2003,2239,2251,2267,2281,2287,2309,2311,2347,2381,2393 %N A225590 Primes p such that A217015(p) is a prime number. That is, when applying the walk of a square spiral to the data of rotated-square spiral, on step p a prime number is hit. %C A225590 Corresponding primes with prime indices, in sorted order: A225754. %Y A225590 Cf. A217015, A217296, A215468, A214526, A225754. %K A225590 nonn %O A225590 1,1 %A A225590 _Alex Ratushnyak_, May 15 2013