%I #9 Mar 31 2024 15:13:38
%S 5,11,31,43,71,83,89,97,101,103,113,131,139,149,157,167,193,197,223,
%T 229,251,257,347,383,389,397,401,419,431,433,439,449,467,487,491,499,
%U 521,557,569,587,599,601,607,613,641,643,653,673,701,709,739,839,853,857,863,887
%N Primes for which -38 is a primitive root.
%H Vincenzo Librandi, <a href="/A105910/b105910.txt">Table of n, a(n) for n = 1..1000</a>
%H <a href="/index/Pri#primes_root">Index entries for primes by primitive root</a>
%t pr=-38; Select[Prime[Range[200]], MultiplicativeOrder[pr, # ] == #-1 &]
%K nonn
%O 1,1
%A _N. J. A. Sloane_, Apr 24 2005