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A216574
Numbers n such that the n-th Fibonacci number is prime, but cannot be written in the form a^2 + 10*b^2.
0
3, 4, 5, 7, 13, 17, 23, 29, 43, 47, 83, 137, 433, 449, 509, 569, 571, 2971, 4723, 5387, 9677, 14431, 30757, 50833, 104911, 201107, 433781, 604711, 931517, 1049897, 1285607, 1636007
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OFFSET
1,1
LINKS
Table of n, a(n) for n=1..32.
Blair Kelly,
Factorizations of Fibonacci and Lucas numbers
CROSSREFS
Cf.
A000045
,
A001605
.
Sequence in context:
A079463
A325422
A190213
*
A216561
A192269
A284618
Adjacent sequences:
A216571
A216572
A216573
*
A216575
A216576
A216577
KEYWORD
nonn
AUTHOR
V. Raman
, Sep 08 2012
STATUS
approved
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Last modified May 12 22:54 EDT 2024. Contains 372497 sequences. (Running on oeis4.)