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 A217656 #20 Oct 12 2012 11:58:09 %S A217656 1201,1621,3301,4561,5821,6661,8761,9181,9601,10861,11701,12541,13381, %T A217656 14221,15061,15901,16741,17581,19681,20101,20521,22621,23041,25561, %U A217656 25981,26821,27241,28081,28921,29761,30181,33961,34381,35221,36061,36901,37321 %N A217656 Primes p such that p = 361 + 420*k for some k. %C A217656 This is one prime congruence class of a wheel factorization of mod 420. The wheel has 96 spokes. %t A217656 Select[Prime[Range[50000]], Mod[#, 420]== 361 &] %K A217656 nonn %O A217656 1,1 %A A217656 _Joshua S.M. Weiner_, Oct 09 2012