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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
OFFSET
1,2
COMMENTS
Union of {0} and A033949.
Numbers n such that A046145(n)=0 except n=1.
MATHEMATICA
Prepend[Select[Range[2, 123], Not[IntegerQ[PrimitiveRoot[#]]] &], 0] (* Alonso del Arte, Dec 12 2011 *)
CROSSREFS
Sequence in context: A050275 A363863 A033949 * A272592 A062373 A180690
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