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A216563 Numbers n such that the n-th Lucas number is prime and can be written in the form a^2 + 5*b^2. 0
4, 13, 31, 61, 313, 613, 5851, 7741, 13963, 193201, 344293, 387433 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..12.

Blair Kelly, Factorizations of Fibonacci and Lucas numbers

CROSSREFS

Cf. A000032, A001606.

Sequence in context: A100136 A097120 A098536 * A011937 A307304 A097122

Adjacent sequences:  A216560 A216561 A216562 * A216564 A216565 A216566

KEYWORD

nonn

AUTHOR

V. Raman, Sep 08 2012

STATUS

approved

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Last modified August 1 03:50 EDT 2021. Contains 346384 sequences. (Running on oeis4.)