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Numbers with primitive root -8.
19

%I #5 Mar 31 2014 02:42:05

%S 5,23,25,29,47,53,71,101,125,149,167,173,191,197,239,263,269,293,311,

%T 317,359,383,389,461,479,503,509,529,557,599,625,647,653,677,701,719,

%U 743,773,797,821,839,841,863,887,941,983,1031,1061,1109,1151,1223,1229

%N Numbers with primitive root -8.

%H Vincenzo Librandi, <a href="/A167804/b167804.txt">Table of n, a(n) for n = 1..1000</a>

%t pr=-8; Select[Range[2,2000], MultiplicativeOrder[pr,# ] == EulerPhi[ # ] &]

%Y Cf. A105880 (primes with primitive root -8)

%K nonn

%O 1,1

%A _T. D. Noe_, Nov 12 2009