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A106922 Primes of the form x^2-xy+15y^2, with x and y nonnegative. 2
17, 59, 71, 139, 163, 197, 223, 317, 373, 383, 389, 439, 461, 479, 521, 547, 631, 641, 677, 727, 733, 743, 787, 827, 953, 1019, 1063, 1103, 1181, 1201, 1229, 1237, 1327, 1361, 1373, 1511, 1559, 1619, 1657, 1693, 1747, 1787, 1823, 1907, 1913, 1951 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Discriminant=-59.

LINKS

Vincenzo Librandi, Table of n, a(n) for n = 1..1000

N. J. A. Sloane et al., Binary Quadratic Forms and OEIS (Index to related sequences, programs, references)

MATHEMATICA

QuadPrimes[1, -1, 15, 10000] (* see A106856 *) Note: the original QuadPrimes had a bug which could sometimes give wrong answers. This sequence should be checked (unless the coefficient of xy in the quadratic form is zero, in which case QuadPrimes gives correct answers). - N. J. A. Sloane, Jun 04 2014

CROSSREFS

Sequence in context: A020879 A058319 A095089 * A110092 A141896 A104165

Adjacent sequences:  A106919 A106920 A106921 * A106923 A106924 A106925

KEYWORD

nonn,easy

AUTHOR

T. D. Noe, May 09 2005

STATUS

approved

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Last modified July 22 19:50 EDT 2014. Contains 244836 sequences.