A216576 - cp's OEIS frontend

A216576 Numbers n such that n-th Lucas number is prime, but cannot be written in the form a^2 + 10*b^2.

%I A216576 #14 May 02 2013 13:12:50
%S A216576 0,2,4,7,8,11,16,19,31,47,71,79,503,863,4787,5851,8467,10691,12251,
%T A216576 13963,36779,44507,56003,81671,94823,148091,202667,574219,616787,
%U A216576 637751,692147
%N A216576 Numbers n such that n-th Lucas number is prime, but cannot be written in the form a^2 + 10*b^2.
%H A216576 Blair Kelly, <a href="http://mersennus.net/fibonacci">Factorizations of Fibonacci and Lucas numbers</a>
%Y A216576 Cf. A000032, A001606.
%K A216576 nonn
%O A216576 1,2
%A A216576 _V. Raman_, Sep 08 2012

cp's OEIS Frontend

A216576 Numbers n such that n-th Lucas number is prime, but cannot be written in the form a^2 + 10*b^2.