A216571 Numbers n such that the n-th Lucas number is prime and can be written in the form a^2 + 6*b^2.

4, 11, 313, 4787, 10691, 12251, 14449, 35449, 36779, 44507, 51169, 56003, 148091, 193201, 202667, 387433, 616787, 692147

Offset

1,1

Links

Table of n, a(n) for n=1..18.

Blair Kelly, Factorizations of Fibonacci and Lucas numbers

Crossrefs

Cf. A000032, A001606.

Sequence in context: A092658 A304888 A316572 * A299046 A113314 A180057

Adjacent sequences: A216568 A216569 A216570 * A216572 A216573 A216574

Keyword

nonn

Author

V. Raman, Sep 08 2012

Status

approved