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A216576
Numbers n such that n-th Lucas number is prime, but cannot be written in the form a^2 + 10*b^2.
1
0, 2, 4, 7, 8, 11, 16, 19, 31, 47, 71, 79, 503, 863, 4787, 5851, 8467, 10691, 12251, 13963, 36779, 44507, 56003, 81671, 94823, 148091, 202667, 574219, 616787, 637751, 692147
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OFFSET
1,2
LINKS
Table of n, a(n) for n=1..31.
Blair Kelly,
Factorizations of Fibonacci and Lucas numbers
CROSSREFS
Cf.
A000032
,
A001606
.
Sequence in context:
A182246
A118248
A132679
*
A116617
A091996
A085262
Adjacent sequences:
A216573
A216574
A216575
*
A216577
A216578
A216579
KEYWORD
nonn
AUTHOR
V. Raman
, Sep 08 2012
STATUS
approved
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Last modified April 24 15:57 EDT 2024. Contains 371961 sequences. (Running on oeis4.)