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A019337 Primes with primitive root 7. 5
2, 5, 11, 13, 17, 23, 41, 61, 67, 71, 79, 89, 97, 101, 107, 127, 151, 163, 173, 179, 211, 229, 239, 241, 257, 263, 269, 293, 347, 349, 359, 379, 397, 431, 433, 443, 461, 491, 499, 509, 521, 547, 577, 593, 599, 601, 631, 659, 677, 683, 733, 739, 743, 761, 773, 797, 823 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Appears to be the numbers k such that the sequence 7^n mod k has period of k-1. All odd entries appear to be congruent to {1,5,7,11} mod 12. - Gary Detlefs_, May 21 2014

LINKS

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

Index entries for primes by primitive root

MATHEMATICA

pr=7; Select[Prime[Range[200]], MultiplicativeOrder[pr, # ] == #-1 &]

CROSSREFS

Sequence in context: A066149 A215423 A019387 * A086518 A156672 A145669

Adjacent sequences:  A019334 A019335 A019336 * A019338 A019339 A019340

KEYWORD

nonn

AUTHOR

David W. Wilson

STATUS

approved

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Last modified October 2 05:40 EDT 2014. Contains 247537 sequences.