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A240096 Numbers with primitive root 15. 10
2, 4, 13, 19, 23, 26, 29, 37, 38, 41, 46, 47, 58, 73, 74, 82, 83, 89, 94, 97, 101, 107, 139, 146, 149, 151, 157, 166, 167, 169, 178, 193, 194, 199, 202, 214, 227, 263, 269, 271, 278, 281, 298, 302, 313, 314, 334, 337, 338, 347, 361, 373, 379, 383, 386, 389 (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 = 15; Select[Range[2, 500], MultiplicativeOrder[pr, #] == EulerPhi[#] &]

Join[{2, 4, 13}, Select[Range[2, 400], PrimitiveRoot[#, 15]==15&]] (* Harvey P. Dale, Jun 30 2018 *)

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), A240094 (r=14).

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).

Sequence in context: A018701 A070152 A176126 * A018761 A276118 A179114

Adjacent sequences:  A240093 A240094 A240095 * A240097 A240098 A240099

KEYWORD

nonn,easy

AUTHOR

Vincenzo Librandi, Apr 01 2014

STATUS

approved

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Last modified July 12 15:09 EDT 2020. Contains 335665 sequences. (Running on oeis4.)