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 A040978 Primes p such that x^5 = 17 has a solution mod p. 2

%I #11 Sep 08 2022 08:44:53

%S 2,3,5,7,13,17,19,23,29,37,43,47,53,59,67,73,79,83,89,97,101,103,107,

%T 109,113,127,137,139,149,157,163,167,173,179,181,193,197,199,223,227,

%U 229,233,239,257,263,269,277,283

%N Primes p such that x^5 = 17 has a solution mod p.

%C Complement of A040979 relative to A000040. - _Vincenzo Librandi_, Sep 13 2012

%H Vincenzo Librandi, <a href="/A040978/b040978.txt">Table of n, a(n) for n = 1..1000</a>

%t ok[p_] := Reduce[Mod[x^5 - 17, p] == 0, x, Integers] =!= False; Select[Prime[Range[150]], ok] (* _Vincenzo Librandi_, Sep 12 2012 *)

%o (Magma) [p: p in PrimesUpTo(400) | exists(t){x : x in ResidueClassRing(p) | x^5 eq 17}]; // _Vincenzo Librandi_, Sep 19 2012

%Y Cf. A000040, A040979.

%K nonn,easy

%O 1,1

%A _N. J. A. Sloane_.

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Last modified December 3 22:01 EST 2023. Contains 367540 sequences. (Running on oeis4.)