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A167798 Numbers with primitive root -2. 19
5, 7, 13, 23, 25, 29, 37, 47, 49, 53, 61, 71, 79, 101, 103, 125, 149, 167, 169, 173, 181, 191, 197, 199, 239, 263, 269, 271, 293, 311, 317, 343, 349, 359, 367, 373, 383, 389, 421, 461, 463, 479, 487, 503, 509, 529, 541, 557, 599, 607, 613, 625, 647, 653, 661 (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=-2; Select[Range[2, 2000], MultiplicativeOrder[pr, # ] == EulerPhi[ # ] &]

CROSSREFS

Cf. A105874 (primes with primitive root -2)

Sequence in context: A314330 A022319 A207079 * A165815 A216738 A216774

Adjacent sequences:  A167795 A167796 A167797 * A167799 A167800 A167801

KEYWORD

nonn

AUTHOR

T. D. Noe, Nov 12 2009

STATUS

approved

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Last modified August 20 07:48 EDT 2019. Contains 326143 sequences. (Running on oeis4.)