

A019337


Primes with primitive root 7.


6



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
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OFFSET

1,1


COMMENTS

All terms apart from the first are == 5, 11, 13, 15, 17, 23 (mod 28) since 7 is a quadratic residue modulo any other prime. By Artin's conjecture, this sequence contains about 37.395% of all primes, that is, about 74.79% of all primes == 5, 11, 13, 15, 17, 23 (mod 28).  Jianing Song, Sep 05 2018


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

Cf. A167795.
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



