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%I A167800 #5 Mar 31 2014 01:50:05
%S A167800 3,7,9,11,19,23,27,47,49,59,67,71,79,81,83,103,107,121,131,139,163,
%T A167800 167,179,191,199,211,227,239,243,263,271,311,343,347,359,361,367,379,
%U A167800 383,419,443,463,467,479,487,491,503,523,529,547,563,587,599,607,619,647
%N A167800 Numbers with primitive root -4.
%H A167800 Vincenzo Librandi, <a href="/A167800/b167800.txt">Table of n, a(n) for n = 1..1000</a>
%t A167800 pr=-4; Select[Range[2,2000], MultiplicativeOrder[pr,# ] == EulerPhi[ # ] &]
%Y A167800 Cf. A105876 (primes with primitive root -4)
%K A167800 nonn
%O A167800 1,1
%A A167800 _T. D. Noe_, Nov 12 2009

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