A106948 - OEIS

A106948

Primes of the form x^2+xy+18y^2, with x and y nonnegative.

107, 293, 509, 647, 739, 971, 1013, 1039, 1123, 1217, 1361, 1367, 1373, 1423, 1663, 1811, 2083, 2099, 2239, 2309, 2351, 2657, 2677, 2917, 3181, 3343, 3517, 3533, 3539, 3623, 3671, 3803, 4003, 4079, 4253, 4483, 4691, 4957, 5273, 5581, 5783

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

OFFSET

1,1

COMMENTS

Discriminant=-71.

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[1, 1, 18, 10000] (* see A106856 *)

CROSSREFS

Sequence in context: A123300 A238669 A142018 * A139989 A059699 A142421

Adjacent sequences: A106945 A106946 A106947 * A106949 A106950 A106951

KEYWORD

nonn,easy

AUTHOR

T. D. Noe, May 09 2005

STATUS

approved