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A040130
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Primes p such that x^4 = 15 has a solution mod p.
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2
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2, 3, 5, 7, 11, 43, 53, 59, 61, 67, 71, 103, 109, 113, 127, 131, 137, 163, 179, 181, 191, 223, 239, 241, 251, 257, 283, 307, 311, 317, 349, 359, 367, 419, 431, 463, 479, 487, 491, 523, 541, 547, 557, 593, 599, 607
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OFFSET
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1,1
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LINKS
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Vincenzo Librandi, Table of n, a(n) for n = 1..1000
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MATHEMATICA
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ok [p_]:=Reduce[Mod[x^4 - 15, p]== 0, x, Integers]=!= False; Select[Prime[Range[180]], ok] (* Vincenzo Librandi, Sep 12 2012 *)
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PROG
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(MAGMA) [p: p in PrimesUpTo(800) | exists(t){x : x in ResidueClassRing(p) | x^4 eq 15}]; // Vincenzo Librandi, Sep 12 2012
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CROSSREFS
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Sequence in context: A141500 A215162 A059999 * A127727 A036343 A058253
Adjacent sequences: A040127 A040128 A040129 * A040131 A040132 A040133
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KEYWORD
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nonn,easy
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AUTHOR
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N. J. A. Sloane.
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STATUS
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approved
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