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 A216566 #12 May 02 2013 13:10:34 %S A216566 2,4,5,8,11,16,17,41,47,53,71,113,353,503,617,863,1097,1361,4787,4793, %T A216566 10691,12251,19469,36779,44507,56003,81671,89849,94823,140057,148091, %U A216566 159521,183089,202667,443609,532277,616787,631181,637751,651821,692147 %N A216566 Numbers n such that the n-th Lucas number is prime, but cannot be written in the form a^2 + b^2. %H A216566 Blair Kelly, <a href="http://mersennus.net/fibonacci">Factorizations of Fibonacci and Lucas numbers</a> %Y A216566 Cf. A000032, A001606. %K A216566 nonn %O A216566 1,1 %A A216566 _V. Raman_, Sep 08 2012