A139991 - OEIS

A139991

Primes of the form 15x^2+56y^2.

71, 191, 239, 359, 431, 599, 911, 1031, 1439, 1871, 2039, 2111, 2591, 2711, 2879, 3119, 3719, 4271, 4391, 4799, 5231, 5279, 5399, 5471, 5639, 6311, 6791, 6911, 6959, 7079, 7151, 7919, 8831, 8999, 9311, 9431, 9479, 9839, 10151, 10271, 11159

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OFFSET

1,1

COMMENTS

Discriminant=-3360. See A139827 for more information.

Also primes of the forms 39x^2+12xy+44y^2 and 36x^2+12xy+71y^2. See A140633. - T. D. Noe, May 19 2008

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)

FORMULA

The primes are congruent to {71, 191, 239, 359, 431, 599} (mod 840).

MATHEMATICA

QuadPrimes2[15, 0, 56, 10000] (* see A106856 *)

PROG

(Magma) [p: p in PrimesUpTo(12000) | p mod 840 in [71, 191, 239, 359, 431, 599]]; // Vincenzo Librandi, Aug 03 2012

CROSSREFS

Sequence in context: A068364 A142612 A295835 * A140007 A023107 A174370

Adjacent sequences: A139988 A139989 A139990 * A139992 A139993 A139994

KEYWORD

nonn,easy

AUTHOR

T. D. Noe, May 02 2008

STATUS

approved