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A216881
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Primes p such that x^7 = 3 has a solution mod p.
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2
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2, 3, 5, 7, 11, 13, 17, 19, 23, 31, 37, 41, 47, 53, 59, 61, 67, 73, 79, 83, 89, 97, 101, 103, 107, 109, 131, 137, 139, 149, 151, 157, 163, 167, 173, 179, 181, 191, 193, 199, 223, 227, 229, 233, 241, 251, 257, 263, 269, 271, 277, 283, 293, 307, 311, 313, 317
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OFFSET
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1,1
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COMMENTS
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Complement of A042969 relative to A000040.
Differs from A042966 first at index 98. - R. J. Mathar, Mar 13 2013
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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^7 - 3, p] == 0, x, Integers] =!= False; Select[Prime[Range[150]], ok]
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PROG
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(MAGMA) [p: p in PrimesUpTo(500) | exists(t){x: x in ResidueClassRing(p) | x^7 eq 3}];
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CROSSREFS
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Sequence in context: A102348 A161929 A216882 * A042966 A128898 A006514
Adjacent sequences: A216878 A216879 A216880 * A216882 A216883 A216884
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KEYWORD
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nonn,easy
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AUTHOR
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Vincenzo Librandi, Sep 19 2012
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STATUS
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approved
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