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 A225754 #5 May 15 2013 19:48:04 %S A225754 5,11,13,29,31,41,67,71,73,79,127,137,193,199,211,293,313,421,499,503, %T A225754 619,631,647,661,673,773,811,967,991,1013,1129,1163,1553,1567,1597, %U A225754 1601,1607,1747,1777,1783,1789,1801,1831,1861,1997,2039,2053,2087,2099,2113,2287,2311 %N A225754 Primes p such that A217296(p) is a prime number. That is, when applying the walk of rotated-square spiral to the data of square spiral, on step p a prime number is hit. %C A225754 Corresponding primes with prime indices, in sorted order: A225590. The intersection of a(n) with A225590 begins: 11, 67, 421, 619, 773, 1553, 1601, 2287, 2311, 2381, 2609, 3169, 3181, 3491, 3511, 4157, 4597, 4639, 6263, 7129, 7177, 7193, 8291, 9277. %Y A225754 Cf. A217015, A217296, A215468, A214526, A225590. %K A225754 nonn %O A225754 1,1 %A A225754 _Alex Ratushnyak_, May 15 2013