A216555 - cp's OEIS frontend

A216555 Numbers n such that the n-th Lucas number is prime, but cannot be written in the form a^2 + 3*b^2.

%I A216555 #12 May 02 2013 13:09:24
%S A216555 0,5,7,8,13,16,31,37,47,53,61,71,79,503,613,863,7741,19469,81671,
%T A216555 94823,344293,532277,631181,637751,651821
%N A216555 Numbers n such that the n-th Lucas number is prime, but cannot be written in the form a^2 + 3*b^2.
%H A216555 Blair Kelly, <a href="http://mersennus.net/fibonacci">Factorizations of Fibonacci and Lucas numbers</a>
%Y A216555 Cf. A000032, A001606.
%K A216555 nonn
%O A216555 1,2
%A A216555 _V. Raman_, Sep 08 2012

cp's OEIS Frontend

A216555 Numbers n such that the n-th Lucas number is prime, but cannot be written in the form a^2 + 3*b^2.