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A139655
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Primes of the form x^2 + 280*y^2.
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2
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281, 401, 449, 569, 641, 809, 1009, 1129, 1201, 1289, 1409, 1481, 1801, 2081, 2129, 2521, 2689, 2801, 2969, 3049, 3089, 3329, 3361, 3529, 3761, 3889, 3929, 4001, 4201, 4481, 4561, 4649, 4729, 5009, 5209, 5441, 5569, 5849, 5881, 6329, 6449
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OFFSET
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1,1
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COMMENTS
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Discriminant=-1120. See A139643 for more information.
The primes are congruent to {1, 9, 81, 121, 169, 249} (mod 280).
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LINKS
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MATHEMATICA
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QuadPrimes2[1, 0, 280, 10000] (* see A106856 *)
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PROG
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(Magma) [ p: p in PrimesUpTo(7000) | p mod 280 in {1, 9, 81, 121, 169, 249}]; // Vincenzo Librandi, Jul 29 2012
(Magma) k:=280; [p: p in PrimesUpTo(7000) | NormEquation(k, p) eq true]; // Bruno Berselli, Jun 01 2016
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CROSSREFS
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KEYWORD
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nonn,easy
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AUTHOR
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STATUS
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approved
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