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A106868 Primes of the form 2x^2-xy+3y^2, with x and y nonnegative. 1
2, 3, 29, 31, 47, 73, 131, 151, 163, 193, 197, 233, 239, 277, 349, 353, 397, 487, 491, 499, 509, 547, 577, 601, 647, 653, 683, 811, 857, 859, 863, 929, 947, 1013, 1021, 1039, 1093, 1283, 1289, 1291, 1297, 1301, 1327, 1361, 1429, 1499, 1511, 1531 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Discriminant=-23.

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[2, -1, 3, 10000] (* see A106856 *)

CROSSREFS

Cf. A028929, A106867.

Sequence in context: A324941 A028868 A081332 * A098419 A041193 A042335

Adjacent sequences:  A106865 A106866 A106867 * A106869 A106870 A106871

KEYWORD

nonn,easy

AUTHOR

T. D. Noe, May 09 2005

STATUS

approved

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Last modified February 24 01:16 EST 2020. Contains 332195 sequences. (Running on oeis4.)