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 A216565 #14 May 02 2013 13:11:02 %S A216565 0,2,5,7,8,11,16,17,19,37,41,47,53,71,79,113,353,503,617,863,1097, %T A216565 1361,4787,4793,8467,10691,12251,14449,19469,35449,36779,44507,51169, %U A216565 56003,81671,89849,94823,140057,148091,159521,183089,202667,443609,532277,574219,616787,631181,637751,651821,692147 %N A216565 Numbers n such that the n-th Lucas number is prime, but cannot be written in the form a^2 + 5*b^2. %H A216565 Blair Kelly, <a href="http://mersennus.net/fibonacci">Factorizations of Fibonacci and Lucas numbers</a> %Y A216565 Cf. A000032, A001606. %K A216565 nonn %O A216565 1,2 %A A216565 _V. Raman_, Sep 08 2012