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A038884
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Primes p such that 13 is not a square mod p.
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4
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2, 5, 7, 11, 19, 31, 37, 41, 47, 59, 67, 71, 73, 83, 89, 97, 109, 137, 149, 151, 163, 167, 193, 197, 223, 227, 229, 239, 241, 271, 281, 293, 307, 317, 331, 349, 353, 359, 379, 383, 397, 401, 409, 421, 431, 449, 457
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OFFSET
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1,1
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COMMENTS
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Inert rational primes in the field Q(sqrt(13)). - N. J. A. Sloane, Dec 26 2017
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LINKS
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FORMULA
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MATHEMATICA
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Select[Prime@Range[120], JacobiSymbol[13, #] == -1 &] (* Vincenzo Librandi, Sep 08 2012 *)
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PROG
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(PARI) list(lim)=my(v=List()); foprime(p=2, lim, if(kronecker(13, p)<0, listput(v, p))); Vec(v) \\ Charles R Greathouse IV, Mar 18 2018
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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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EXTENSIONS
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STATUS
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approved
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