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A167798 Numbers with primitive root -2. 19

%I

%S 5,7,13,23,25,29,37,47,49,53,61,71,79,101,103,125,149,167,169,173,181,

%T 191,197,199,239,263,269,271,293,311,317,343,349,359,367,373,383,389,

%U 421,461,463,479,487,503,509,529,541,557,599,607,613,625,647,653,661

%N Numbers with primitive root -2.

%H Vincenzo Librandi, <a href="/A167798/b167798.txt">Table of n, a(n) for n = 1..1000</a>

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

%Y Cf. A105874 (primes with primitive root -2)

%K nonn

%O 1,1

%A _T. D. Noe_, Nov 12 2009

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Last modified May 28 00:30 EDT 2022. Contains 354110 sequences. (Running on oeis4.)