A107011 - OEIS

A107011

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

5, 23, 47, 59, 113, 179, 251, 269, 317, 383, 401, 449, 509, 587, 599, 617, 641, 653, 719, 773, 839, 881, 911, 947, 971, 983, 1061, 1193, 1259, 1277, 1307, 1409, 1433, 1439, 1523, 1571, 1607, 1697, 1709, 1787, 1871, 1973, 2027, 2039, 2069, 2297

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

OFFSET

1,1

COMMENTS

Discriminant=-99.

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

CROSSREFS

Sequence in context: A146467 A053518 A154625 * A031387 A057622 A055626

Adjacent sequences: A107008 A107009 A107010 * A107012 A107013 A107014

KEYWORD

nonn,easy

AUTHOR

T. D. Noe, May 09 2005

STATUS

approved