A106920 - OEIS

A106920

Primes of the form 3x^2-xy+5y^2, with x and y nonnegative.

3, 5, 7, 29, 41, 79, 107, 127, 137, 199, 239, 241, 251, 277, 311, 433, 491, 499, 577, 593, 599, 643, 647, 653, 661, 709, 757, 853, 877, 907, 971, 1039, 1051, 1069, 1087, 1091, 1097, 1259, 1301, 1307, 1319, 1423, 1451, 1543, 1579, 1583, 1597, 1609

(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[3, -1, 5, 10000] (* see A106856 *)

CROSSREFS

Sequence in context: A154551 A058047 A098860 * A060273 A124077 A288891

Adjacent sequences: A106917 A106918 A106919 * A106921 A106922 A106923

KEYWORD

nonn,easy

AUTHOR

T. D. Noe, May 09 2005

STATUS

approved