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%I #15 Mar 31 2014 16:52:25
%S 2,5,7,37,47,53,61,67,73,97,103,131,149,157,173,191,199,229,233,251,
%T 257,263,281,283,337,353,359,401,409,421,433,439,467,479,487,491,499,
%U 503,509,521,523,541,557,563,593,599,631,643,659,733,743,769,787,811,821,827,829
%N Primes with primitive root 87.
%H Vincenzo Librandi, <a href="/A019409/b019409.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=87; Select[Prime[Range[200]], MultiplicativeOrder[pr, # ] == #-1 &]
%K nonn
%O 1,1
%A _David W. Wilson_