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A139848
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Primes of the form 7x^2 + 15y^2.
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1
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7, 43, 67, 127, 163, 463, 487, 547, 823, 883, 907, 967, 1087, 1303, 1327, 1423, 1663, 1723, 1747, 2083, 2143, 2347, 2503, 2647, 2683, 2767, 3067, 3187, 3343, 3607, 3823, 3847, 3907, 3943, 4027, 4243, 4327, 4363, 4447, 4603, 4663, 4783, 5023
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OFFSET
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1,1
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COMMENTS
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Discriminant = -420. See A139827 for more information.
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LINKS
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FORMULA
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The primes are congruent to {7, 43, 67, 127, 163, 247, 403} (mod 420).
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MATHEMATICA
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QuadPrimes2[7, 0, 15, 10000] (* see A106856 *)
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PROG
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(Magma) [ p: p in PrimesUpTo(6000) | p mod 420 in {7, 43, 67, 127, 163, 247, 403}]; // Vincenzo Librandi, Jul 29 2012
(PARI) list(lim)=my(v=List([7]), s=[43, 67, 127, 163, 247, 403]); forprime(p=43, lim, if(setsearch(s, p%420), listput(v, p))); Vec(v) \\ Charles R Greathouse IV, Feb 10 2017
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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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