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A106870 Primes of the form x^2+xy+7y^2, with x and y nonnegative. +0
2
7, 13, 19, 31, 37, 43, 67, 73, 79, 97, 103, 127, 139, 151, 157, 163, 181, 193, 199, 211, 223, 229, 241, 271, 277, 283, 307, 313, 349, 367, 373, 379, 397, 409, 421, 439, 457, 463, 487, 499, 523, 541, 571, 577, 601, 607, 613, 619, 631, 643, 661, 673, 709, 727 (list; graph; listen)
OFFSET

1,1

COMMENT

Discriminant=-27. See A106856 for more information.

MATHEMATICA

QuadPrimes[1, 1, 7, 10000] (* see A106856 *)

CROSSREFS

Sequence in context: A144921 A040079 A038160 this_sequence A040038 A081765 A091180

Adjacent sequences: A106867 A106868 A106869 this_sequence A106871 A106872 A106873

KEYWORD

nonn,easy

AUTHOR

T. D. Noe (noe(AT)sspectra.com), May 09 2005

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.


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