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A216570 Numbers n such that the n-th Fibonacci number is prime, but cannot be written in the form a^2 + 6*b^2. 0

%I #12 May 02 2013 13:10:25

%S 3,4,5,7,11,13,17,29,43,83,131,137,449,509,569,571,2971,4723,5387,

%T 9677,14431,30757,104911,130021,148091,201107,397379,433781,604711,

%U 931517,1049897,1803059

%N Numbers n such that the n-th Fibonacci number is prime, but cannot be written in the form a^2 + 6*b^2.

%H Blair Kelly, <a href="http://mersennus.net/fibonacci">Factorizations of Fibonacci and Lucas numbers</a>

%Y Cf. A000045, A001605.

%K nonn

%O 1,1

%A _V. Raman_, Sep 08 2012

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Last modified May 10 15:26 EDT 2024. Contains 372387 sequences. (Running on oeis4.)