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A038906
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Primes p such that 31 is not a square mod p.
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2
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7, 13, 17, 19, 29, 37, 47, 53, 59, 61, 67, 71, 73, 89, 103, 107, 131, 137, 163, 181, 191, 197, 211, 227, 229, 241, 269, 277, 283, 307, 311, 313, 337, 353, 359, 379, 389, 401, 409, 419, 431, 433, 439, 443, 449, 457
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OFFSET
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1,1
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COMMENTS
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Also, only entries p=1 (mod 4) of the sequence are not squares mod 31 (from the quadratic reciprocity law). - Lekraj Beedassy, Jul 21 2004
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LINKS
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MATHEMATICA
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Select[Prime@Range[120], JacobiSymbol[31, #] == -1 &] (* Vincenzo Librandi, Sep 09 2012 *)
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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