A139892 Primes of the form 10x^2+21y^2.

31, 61, 181, 199, 229, 271, 349, 439, 661, 829, 1021, 1039, 1069, 1231, 1279, 1399, 1669, 1741, 1861, 1879, 1951, 2029, 2239, 2341, 2551, 2719, 2749, 2791, 3079, 3181, 3391, 3541, 3559, 3631, 3709, 3919, 4021, 4231, 4261, 4549, 4591, 4639

Offset

1,1

Comments

Discriminant=-840. 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 {31, 61, 181, 199, 229, 271, 349, 391, 439, 559, 661, 829} (mod 840).

Mathematica

QuadPrimes2[10, 0, 21, 10000] (* see A106856 *)

Prog

(Magma) [ p: p in PrimesUpTo(5000) | p mod 840 in {31, 61, 181, 199, 229, 271, 349, 391, 439, 559, 661, 829}]; // Vincenzo Librandi, Jul 30 2012

Crossrefs

Sequence in context: A282326 A114991 A225874 * A088464 A088463 A195745

Adjacent sequences: A139889 A139890 A139891 * A139893 A139894 A139895

Keyword

nonn,easy

Author

T. D. Noe, May 02 2008

Status

approved