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%I #8 Sep 08 2022 08:45:02
%S 7,13,19,37,53,61,67,73,79,97,103,131,139,151,157,163,181,193,199,211,
%T 241,271,313,331,337,349,367,373,379,409,421,443,463,487,521,523,541,
%U 547,571,577,599,607,613,619,631,661,673,677,709,751,757,769,787,823
%N Primes p such that x^39 = 2 has no solution mod p.
%C Complement of A049571 relative to A000040.
%H Vincenzo Librandi, <a href="/A059351/b059351.txt">Table of n, a(n) for n = 1..1000</a>
%t ok[p_] := Reduce[Mod[x^39 - 2, p] == 0, x, Integers] == False; Select[Prime[Range[150]], ok ] (* _Vincenzo Librandi_, Sep 20 2012 *)
%o (Magma) [p: p in PrimesUpTo(850) | forall{x: x in ResidueClassRing(p) | x^39 ne 2 }]; // _Vincenzo Librandi_, Sep 20 2012
%Y Cf. A000040, A049571.
%K nonn,easy
%O 1,1
%A _Klaus Brockhaus_, Jan 27 2001
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