A106877 - OEIS

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A106877

Primes of the form 3x^2+xy+3y^2, with x and y nonnegative.

2

3, 7, 17, 83, 97, 157, 173, 223, 257, 307, 313, 397, 523, 587, 607, 643, 647, 733, 773, 787, 887, 937, 983, 1013, 1223, 1277, 1307, 1427, 1483, 1487, 1613, 1637, 1693, 1753, 1777, 1783, 1907, 2203, 2267, 2273, 2357, 2383, 2393, 2593, 2663, 2677

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

OFFSET

1,1

COMMENTS

Discriminant=-35.

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

CROSSREFS

Sequence in context: A247196 A246764 A128343 * A041949 A222452 A218165

Adjacent sequences: A106874 A106875 A106876 * A106878 A106879 A106880

KEYWORD

nonn,easy

AUTHOR

T. D. Noe, May 09 2005

STATUS

approved