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A216538
Numbers n such that the n-th Lucas number is prime, but cannot be written in the form a^2 + 7*b^2.
0
2, 8, 11, 13, 31, 41, 47, 61, 79, 313, 617, 863, 1097, 4793, 5851, 7741, 12251, 13963, 35449, 36779, 44507, 89849, 140057, 148091, 202667, 387433, 443609, 574219, 631181, 651821
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OFFSET
1,1
LINKS
Table of n, a(n) for n=1..30.
Blair Kelly,
Factorizations of Fibonacci and Lucas numbers
CROSSREFS
Cf.
A000032
,
A001606
.
Sequence in context:
A064611
A059011
A287569
*
A077820
A360649
A297831
Adjacent sequences:
A216535
A216536
A216537
*
A216539
A216540
A216541
KEYWORD
nonn
AUTHOR
V. Raman
, Sep 08 2012
STATUS
approved
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Last modified April 17 23:23 EDT 2024. Contains 371767 sequences. (Running on oeis4.)