%I #12 May 02 2013 13:10:42
%S 4,13,31,61,313,613,5851,7741,13963,193201,344293,387433
%N Numbers n such that the n-th Lucas number is prime and can be written in the form a^2 + 5*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