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A139660 Primes of the form x^2 + 385*y^2. 2
389, 401, 421, 449, 641, 709, 1061, 1409, 1549, 1621, 1709, 1901, 2069, 2269, 2381, 2689, 2909, 3061, 3089, 3221, 3301, 3389, 3469, 3529, 4229, 4349, 4481, 4621, 4789, 4909, 5009, 5021, 5261, 5569, 5581, 5861, 6029, 6301, 6329, 6449, 6469 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Discriminant=-1540. See A139643 for more information.
The primes are congruent to {1, 9, 81, 141, 169, 221, 289, 309, 361, 389, 401, 421, 449, 529, 641, 669, 709, 729, 841, 949, 961, 1061, 1101, 1149, 1241, 1269, 1369, 1401, 1409, 1521} (mod 1540).
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, 0, 385, 10000] (* see A106856 *)
PROG
(Magma) */ k:=385; [p: p in PrimesUpTo(6500) | NormEquation(k, p) eq true]; // Bruno Berselli, Jun 01 2016
CROSSREFS
Sequence in context: A223390 A200970 A104999 * A098078 A160030 A006476
KEYWORD
nonn,easy
AUTHOR
T. D. Noe, Apr 29 2008
STATUS
approved

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Last modified March 28 13:42 EDT 2024. Contains 371254 sequences. (Running on oeis4.)