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A105881 Primes for which -9 is a primitive root. 2
2, 7, 11, 19, 23, 31, 43, 47, 59, 71, 79, 83, 107, 127, 131, 139, 163, 167, 179, 191, 199, 211, 223, 227, 239, 251, 263, 283, 311, 331, 347, 359, 379, 383, 419, 443, 463, 467, 479, 487, 503, 563, 571, 587, 599, 607, 631, 647, 659, 691, 719, 739, 743, 751, 811, 823, 827 (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=-9; Select[Prime[Range[200]], MultiplicativeOrder[pr, # ] == #-1 &]

CROSSREFS

Sequence in context: A103776 A040154 A166862 * A060191 A178899 A023393

Adjacent sequences:  A105878 A105879 A105880 * A105882 A105883 A105884

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Apr 24 2005

STATUS

approved

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Last modified September 20 23:09 EDT 2014. Contains 247020 sequences.