A216848 Odd numbers for which 2 is not a primitive root.

7, 15, 17, 21, 23, 31, 33, 35, 39, 41, 43, 45, 47, 49, 51, 55, 57, 63, 65, 69, 71, 73, 75, 77, 79, 85, 87, 89, 91, 93, 95, 97, 99, 103, 105, 109, 111, 113, 115, 117, 119, 123, 127, 129, 133, 135, 137, 141, 143, 145, 147, 151, 153, 155, 157, 159, 161, 165, 167

Offset: 1

Author

V. Raman, Sep 17 2012

Keywords

• nonn

Links

• Amiram Eldar, Table of n, a(n) for n = 1..10000

Crossrefs

Cf. A002326, A001122, A216838.

Programs

Mathematica

nn = 200; Select[Range[3, nn, 2], PrimitiveRoot[#] =!= 2 &] (* T. D. Noe, Sep 19 2012 *)

PARI

forstep(p=3, 200, 2, if(znorder(Mod(2, p))!=eulerphi(p), print(p)))