%I #12 May 02 2013 13:07:21
%S 2,8,11,13,31,41,47,61,79,313,617,863,1097,4793,5851,7741,12251,13963,
%T 35449,36779,44507,89849,140057,148091,202667,387433,443609,574219,
%U 631181,651821
%N Numbers n such that the n-th Lucas number is prime, but cannot be written in the form a^2 + 7*b^2.
%H Blair Kelly, <a href="http://mersennus.net/fibonacci">Factorizations of Fibonacci and Lucas numbers</a>
%Y Cf. A000032, A001606.
%K nonn
%O 1,1
%A _V. Raman_, Sep 08 2012