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A240093 Numbers with primitive root -13. 14
2, 3, 4, 5, 6, 9, 10, 18, 23, 25, 27, 37, 41, 43, 46, 50, 54, 73, 74, 79, 81, 82, 86, 89, 97, 107, 109, 125, 127, 131, 137, 139, 146, 149, 158, 162, 178, 179, 191, 194, 197, 199, 214, 218, 241, 243, 250, 251, 254, 262, 263, 274, 278, 281, 283, 293, 298, 317 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Vincenzo Librandi, Table of n, a(n) for n = 1..1000

MATHEMATICA

pr = -13; Select[Range[2, 600], MultiplicativeOrder[pr, #] == EulerPhi[#] &]

CROSSREFS

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).

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).

Sequence in context: A052492 A162228 A085714 * A286421 A116546 A108957

Adjacent sequences:  A240090 A240091 A240092 * A240094 A240095 A240096

KEYWORD

nonn,easy

AUTHOR

Vincenzo Librandi, Apr 01 2014

STATUS

approved

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Last modified June 1 20:49 EDT 2020. Contains 334765 sequences. (Running on oeis4.)