

A107134


Primes of the form x^2+28y^2.


2



29, 37, 53, 109, 113, 137, 149, 193, 197, 233, 277, 281, 317, 337, 373, 389, 401, 421, 449, 457, 541, 557, 569, 613, 617, 641, 653, 673, 701, 709, 757, 809, 821, 877, 953, 977, 1009, 1033, 1061, 1093, 1117, 1129, 1201, 1213, 1229, 1289, 1297, 1373, 1381
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OFFSET

1,1


COMMENTS

Discriminant=112. See A107132 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 {1, 9, 25} (mod 28).  T. D. Noe, Apr 29 2008


MATHEMATICA

QuadPrimes2[1, 0, 28, 10000] (* see A106856 *)


PROG

(MAGMA) [ p: p in PrimesUpTo(2000)  p mod 28 in {1, 9, 25} ]; // Vincenzo Librandi, Jul 23 2012


CROSSREFS

Cf. A139643.
Sequence in context: A060769 A031925 A325058 * A139851 A139895 A304688
Adjacent sequences: A107131 A107132 A107133 * A107135 A107136 A107137


KEYWORD

nonn,easy


AUTHOR

T. D. Noe, May 13 2005


STATUS

approved



