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%I #17 Nov 15 2014 09:19:38
%S 5,23,31,37,59,71,73,83,101,109,137,163,173,191,223,227,233,239,241,
%T 251,263,269,271,281,293,331,359,367,373,379,401,409,419,431,449,461,
%U 467,499,509,563,569,587,599,601,613,617,677,727,739,757,769,773,797,809,863,877
%N Primes with primitive root 42.
%H Vincenzo Librandi, <a href="/A019367/b019367.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=42; Select[Prime[Range[200]], MultiplicativeOrder[pr, # ] == #-1 &]
%t Join[{5,23,31,37},Select[Prime[Range[200]],MemberQ[ PrimitiveRootList[ #],42]&]] (* _Harvey P. Dale_, Nov 15 2014 *)
%K nonn
%O 1,1
%A _David W. Wilson_
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