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Numbers with primitive root -5.
19

%I #5 Mar 31 2014 01:57:20

%S 2,4,11,17,19,22,34,37,38,53,59,73,74,79,97,106,113,118,121,131,137,

%T 139,146,151,157,158,173,179,193,194,197,226,233,239,242,257,262,274,

%U 277,278,289,293,302,311,314,317,331,346,353,358,359,361,373,386,394,397

%N Numbers with primitive root -5.

%H Vincenzo Librandi, <a href="/A167801/b167801.txt">Table of n, a(n) for n = 1..1000</a>

%t pr=-5; Select[Range[2,2000], MultiplicativeOrder[pr,# ] == EulerPhi[ # ] &]

%Y Cf. A105877 (primes with primitive root -5)

%K nonn

%O 1,1

%A _T. D. Noe_, Nov 12 2009