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A139835 Primes of the form 2x^2+2xy+43y^2. 1
2, 43, 47, 67, 83, 103, 127, 223, 263, 307, 383, 443, 463, 467, 523, 563, 587, 647, 727, 863, 883, 967, 1063, 1087, 1103, 1123, 1223, 1283, 1307, 1327, 1427, 1447, 1483, 1487, 1543, 1583, 1607, 1667, 1747, 1783, 1787, 1823, 1987, 2027, 2083 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Discriminant=-340. 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 {2, 43, 47, 67, 83, 87, 103, 123, 127, 183, 203, 223, 247, 263, 287, 307, 327} (mod 340).
MATHEMATICA
QuadPrimes2[2, -2, 43, 10000] (* see A106856 *)
PROG
(Magma) [ p: p in PrimesUpTo(3000) | p mod 340 in {2, 43, 47, 67, 83, 87, 103, 123, 127, 183, 203, 223, 247, 263, 287, 307, 327}]; // Vincenzo Librandi, Jul 29 2012
CROSSREFS
Sequence in context: A268467 A236695 A085460 * A354726 A235473 A137415
KEYWORD
nonn,easy
AUTHOR
T. D. Noe, May 02 2008
STATUS
approved

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Last modified February 23 11:40 EST 2024. Contains 370283 sequences. (Running on oeis4.)