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A175594 Numbers having no primitive root. 2
0, 8, 12, 15, 16, 20, 21, 24, 28, 30, 32, 33, 35, 36, 39, 40, 42, 44, 45, 48, 51, 52, 55, 56, 57, 60, 63, 64, 65, 66, 68, 69, 70, 72, 75, 76, 77, 78, 80, 84, 85, 87, 88, 90, 91, 92, 93, 95, 96, 99, 100, 102, 104, 105, 108, 110, 111, 112, 114, 115, 116, 117, 119, 120, 123 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Union of {0} and A033949.

Numbers n such that A046145(n)=0 except n=1.

LINKS

Table of n, a(n) for n=1..65.

MATHEMATICA

Prepend[Select[Range[2, 123], Not[IntegerQ[PrimitiveRoot[#]]] &], 0] (* Alonso del Arte, Dec 12 2011 *)

CROSSREFS

Sequence in context: A279963 A050275 A033949 * A272592 A062373 A180690

Adjacent sequences:  A175591 A175592 A175593 * A175595 A175596 A175597

KEYWORD

nonn

AUTHOR

Vladislav-Stepan Malakhovsky & Juri-Stepan Gerasimov, Jul 20 2010

EXTENSIONS

Corrected by R. J. Mathar, Oct 15 2011

Corrected by Arkadiusz Wesolowski, Sep 06 2012

STATUS

approved

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Last modified December 6 07:11 EST 2019. Contains 329785 sequences. (Running on oeis4.)