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A216862 Primes p such that x^5 = 20 has a solution mod p. 2
2, 3, 5, 7, 13, 17, 19, 23, 29, 37, 43, 47, 53, 59, 67, 71, 73, 79, 83, 89, 97, 103, 107, 109, 113, 127, 137, 139, 149, 157, 163, 167, 173, 179, 193, 197, 199, 223, 227, 229, 233, 239, 251, 257, 263, 269, 277, 283, 293, 307, 311, 313, 317, 337, 347, 349, 353, 359, 367, 373, 379 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Complement of A040985 relative to A000040.

LINKS

Vincenzo Librandi, Table of n, a(n) for n = 1..1000

MATHEMATICA

ok[p_]:=Reduce[Mod[x^5-20, p]==0, x, Integers]=!=False; Select[Prime[Range[150]], ok]

PROG

(MAGMA) [p: p in PrimesUpTo(400) | exists(t){x : x in ResidueClassRing(p) | x^5 eq 20}];

CROSSREFS

Sequence in context: A040161 A175438 A040970 * A040978 A040982 A040980

Adjacent sequences:  A216859 A216860 A216861 * A216863 A216864 A216865

KEYWORD

nonn,easy

AUTHOR

Vincenzo Librandi, Sep 19 2012

STATUS

approved

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Last modified October 25 19:28 EDT 2020. Contains 338012 sequences. (Running on oeis4.)