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Primes for which -25 is a primitive root.
1

%I #9 Mar 31 2024 15:07:57

%S 2,3,7,11,19,23,43,47,59,79,83,103,107,131,139,151,167,179,223,227,

%T 239,263,283,307,311,331,347,359,383,419,431,439,443,463,467,479,491,

%U 499,503,523,547,563,571,587,599,607,619,647,659,683,719,727,743,751,787,811,839

%N Primes for which -25 is a primitive root.

%H Vincenzo Librandi, <a href="/A105897/b105897.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=-25; Select[Prime[Range[200]], MultiplicativeOrder[pr, # ] == #-1 &]

%K nonn

%O 1,1

%A _N. J. A. Sloane_, Apr 24 2005