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A216509 Primes which cannot be written in the form a^2 + 6*b^2. 0
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 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

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

LINKS

Table of n, a(n) for n=1..56.

CROSSREFS

Cf. A033199.

Sequence in context: A072538 A225856 A322173 * A075237 A040062 A115653

Adjacent sequences:  A216506 A216507 A216508 * A216510 A216511 A216512

KEYWORD

nonn

AUTHOR

V. Raman, Sep 08 2012

STATUS

approved

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Last modified July 31 15:18 EDT 2021. Contains 346374 sequences. (Running on oeis4.)