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A139661
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Primes of the form x^2 + 408*y^2.
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2
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409, 433, 457, 577, 769, 937, 1033, 1249, 1657, 1753, 1777, 1801, 1993, 2089, 2161, 2473, 2593, 2617, 2857, 3001, 3217, 3313, 3433, 3673, 3697, 3793, 3889, 4129, 4201, 4297, 4441, 4513, 4657, 5113, 5449, 5521, 5737, 5857, 5881, 6073, 6121
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OFFSET
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1,1
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COMMENTS
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Discriminant = -1632. See A139643 for more information.
The primes are congruent to {1, 25, 49, 121, 145, 169, 217, 361} (mod 408).
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LINKS
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MATHEMATICA
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QuadPrimes2[1, 0, 408, 10000] (* see A106856 *)
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PROG
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(Magma) [ p: p in PrimesUpTo(7000) | p mod 408 in {1, 25, 49, 121, 145, 169, 217, 361}]; // Vincenzo Librandi, Jul 29 2012
(Magma) */ k:=408; [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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