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A139871
Primes of the form 10x^2 + 10xy + 19y^2.
1
19, 79, 139, 151, 211, 271, 439, 571, 739, 811, 919, 1051, 1231, 1399, 1459, 1471, 1531, 1579, 1759, 1999, 2131, 2239, 2251, 2371, 2551, 2659, 2719, 2791, 2851, 3079, 3319, 3511, 3559, 3571, 3691, 3739, 4099, 4111, 4219, 4231, 4639, 4759
OFFSET
1,1
COMMENTS
Discriminant = -660. See A139827 for more information.
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 {19, 79, 139, 151, 211, 259, 271, 391, 439, 571} (mod 660).
MATHEMATICA
QuadPrimes2[10, -10, 19, 10000] (* see A106856 *)
PROG
(Magma) [ p: p in PrimesUpTo(6000) | p mod 660 in {19, 79, 139, 151, 211, 259, 271, 391, 439, 571}]; // Vincenzo Librandi, Jul 30 2012
CROSSREFS
Sequence in context: A372757 A132234 A074822 * A142789 A158491 A201783
KEYWORD
nonn,easy
AUTHOR
T. D. Noe, May 02 2008
STATUS
approved