A167802 Numbers with primitive root -6.

13, 17, 19, 23, 41, 47, 61, 67, 71, 89, 109, 113, 137, 157, 167, 169, 211, 229, 233, 257, 263, 277, 283, 289, 331, 359, 361, 373, 383, 397, 401, 449, 479, 503, 521, 523, 529, 547, 569, 593, 599, 613, 619, 641, 647, 661, 691, 709, 719, 733, 739, 743, 757, 761

Offset: 1

Author

T. D. Noe, Nov 12 2009

Keywords

• nonn

Links

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

Crossrefs

Cf. A105878 (primes with primitive root -6)

Programs

Mathematica

pr=-6; Select[Range[2,2000], MultiplicativeOrder[pr,# ] == EulerPhi[ # ] &]

PARI

is(n)=gcd(n,6)==1 && znorder(Mod(-6,n))==eulerphi(n) && n>1 \\ Charles R Greathouse IV, Feb 23 2017