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Primes with primitive root 78.
1

%I #14 Mar 31 2014 14:17:00

%S 5,17,19,47,61,67,71,73,103,107,127,149,167,179,181,193,197,233,239,

%T 241,251,257,277,293,307,317,347,359,367,373,379,383,419,431,439,443,

%U 457,461,467,479,491,509,521,557,563,569,607,619,641,643,659,727,739,743,769,773

%N Primes with primitive root 78.

%H Vincenzo Librandi, <a href="/A019401/b019401.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=78; Select[Prime[Range[200]], MultiplicativeOrder[pr, # ] == #-1 &]

%K nonn

%O 1,1

%A _David W. Wilson_