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%I #7 Nov 26 2014 13:41:10
%S 5,11,29,37,43,53,59,61,67,83,101,107,109,121,139,149,157,163,173,179,
%T 181,197,227,251,269,277,283,293,317,347,349,379,389,397,419,421,461,
%U 467,491,509,523,541,547,557,563,571,587,613,619,653,659,661,677
%N Numbers with primitive root 18.
%H Vincenzo Librandi, <a href="/A240103/b240103.txt">Table of n, a(n) for n = 1..1000</a>
%t pr = 18; Select[Range[2, 800], MultiplicativeOrder[pr, #] == EulerPhi[#] &]
%o (PARI) is(n)=if(gcd(n, 6)>1, return(0)); my(p=eulerphi(n)); znorder(Mod(18, n), p)==p \\ _Charles R Greathouse IV_, Nov 26 2014
%Y Cf. numbers with positive primitive root r: A167791 (r=2), A167792 (r=3), A167793 (r=5), A167794 (r=6), A167795 (r=7), A167796 (r=8), A167797 (r=10), A240028 (r=11), A240030 (r=12), A240032 (r=13), A240094 (r=14), A240096 (r=15), A240101 (r=17).
%Y Cf. numbers with negative primitive root r: A167798 (r=-2), A167799 (r=-3), A167800 (r=-4), A167801 (r=-5), A167802 (r=-6), A167803 (r=-7), A167804 (r=-8), A167805 (r=-9), A167806 (r=-10), A240029 (r=-11), A240031 (r=-12), A240093 (r=-13), A240095 (r=-14), A240097 (r=-15), A240100 (r=-17), A240102 (r=-18).
%K nonn,easy
%O 1,1
%A _Vincenzo Librandi_, Apr 01 2014
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