A216509 Primes which cannot be written in the form a^2 + 6*b^2.

2, 3, 5, 11, 13, 17, 19, 23, 29, 37, 41, 43, 47, 53, 59, 61, 67, 71, 83, 89, 101, 107, 109, 113, 131, 137, 139, 149, 157, 163, 167, 173, 179, 181, 191, 197, 211, 227, 229, 233, 239, 251, 257, 263, 269, 277, 281, 283, 293, 307, 311, 317, 331, 347, 349, 353

Offset: 1

Author

V. Raman, Sep 08 2012

Keywords

• nonn

Comments

These are primes congruent to {5, 11, 13, 17, 19, 23} mod 24.

Crossrefs

Cf. A033199.