A106987 - OEIS

A106987

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

5, 7, 19, 41, 47, 73, 89, 167, 223, 227, 229, 241, 293, 383, 397, 461, 509, 577, 587, 619, 661, 769, 773, 787, 811, 853, 929, 1021, 1097, 1123, 1181, 1237, 1279, 1319, 1321, 1399, 1487, 1489, 1553, 1571, 1627, 1657, 1669, 1697, 1753, 1783, 1987

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

OFFSET

1,1

COMMENTS

Discriminant=-91.

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

CROSSREFS

Sequence in context: A018581 A146470 A296935 * A342738 A321510 A084198

Adjacent sequences: A106984 A106985 A106986 * A106988 A106989 A106990

KEYWORD

nonn,easy

AUTHOR

T. D. Noe, May 09 2005

STATUS

approved