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 A216882 Primes p such that x^7 = 5 has a solution mod p. 2
 2, 3, 5, 7, 11, 13, 17, 19, 23, 31, 37, 41, 47, 53, 59, 61, 67, 71, 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 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Complement of A042973 relative to A000040. LINKS Vincenzo Librandi, Table of n, a(n) for n = 1..1000 MATHEMATICA ok[p_] := Reduce[Mod[x^7 - 5, p] == 0, x, Integers] =!= False; Select[Prime[Range[250]], ok] PROG (Magma) [p: p in PrimesUpTo(500) | exists(t){x: x in ResidueClassRing(p) | x^7 eq 5}]; CROSSREFS Sequence in context: A358798 A102348 A161929 * A216881 A042966 A128898 Adjacent sequences: A216879 A216880 A216881 * A216883 A216884 A216885 KEYWORD nonn,easy AUTHOR Vincenzo Librandi, Sep 19 2012 STATUS approved

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Last modified December 6 19:52 EST 2023. Contains 367614 sequences. (Running on oeis4.)