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Numbers with primitive root -20.
2

%I #6 Apr 01 2014 12:26:17

%S 11,13,17,31,37,53,59,73,79,113,121,131,137,139,157,169,173,179,191,

%T 199,211,233,239,257,271,277,289,293,313,317,331,337,353,359,379,397,

%U 419,431,433,439,479,499,557,593,599,613,631,653,659,673,677,719,751

%N Numbers with primitive root -20.

%H Vincenzo Librandi, <a href="/A240107/b240107.txt">Table of n, a(n) for n = 1..1000</a>

%t pr = -20; Select[Range[2, 800], MultiplicativeOrder[pr, #] == EulerPhi[#] &]

%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), A240100 (r=17), A240103 (r=18), A240106 (r=19), A240108 (r=20).

%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), A240104 (r=-19).

%K nonn,easy

%O 1,1

%A _Vincenzo Librandi_, Apr 01 2014