A106921 - OEIS

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A106921

Primes of the form x^2+xy+15y^2, with x and y nonnegative.

17, 71, 139, 163, 197, 223, 317, 373, 383, 389, 439, 461, 479, 521, 547, 631, 641, 677, 727, 733, 743, 787, 827, 1019, 1063, 1103, 1181, 1229, 1237, 1327, 1361, 1373, 1511, 1559, 1619, 1657, 1693, 1747, 1823, 1907, 1913, 1951, 2113, 2129, 2131

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,1

COMMENTS

Discriminant=-59.

LINKS

Vincenzo Librandi and Ray Chandler, Table of n, a(n) for n = 1..10000 [First 1000 terms from Vincenzo Librandi]

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

MATHEMATICA

QuadPrimes2[1, 1, 15, 10000] (* see A106856 *)

CROSSREFS

Sequence in context: A039407 A043230 A044010 * A105414 A157910 A141959

Adjacent sequences: A106918 A106919 A106920 * A106922 A106923 A106924

KEYWORD

nonn,easy

AUTHOR

T. D. Noe, May 09 2005

STATUS

approved