A216563 Numbers n such that the n-th Lucas number is prime and can be written in the form a^2 + 5*b^2.

4, 13, 31, 61, 313, 613, 5851, 7741, 13963, 193201, 344293, 387433

Offset: 1

Author

V. Raman, Sep 08 2012

Keywords

• nonn

Links

• Blair Kelly, Factorizations of Fibonacci and Lucas numbers

Crossrefs

Cf. A000032, A001606.