A216567 Numbers n such that the n-th Lucas number is prime and can be written in the form a^2 + b^2.

0, 7, 13, 19, 31, 37, 61, 79, 313, 613, 5851, 7741, 8467, 13963, 14449, 35449, 51169, 193201, 344293, 387433, 574219

Offset

1,2

Links

Table of n, a(n) for n=1..21.

Blair Kelly, Factorizations of Fibonacci and Lucas numbers

Crossrefs

Cf. A000032, A001606.

Sequence in context: A040038 A081765 A257002 * A091180 A272381 A242190

Adjacent sequences: A216564 A216565 A216566 * A216568 A216569 A216570

Keyword

nonn

Author

V. Raman, Sep 08 2012

Status

approved