A105893 - OEIS

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A105893

Primes for which -21 is a primitive root.

1

2, 29, 47, 53, 59, 67, 83, 97, 113, 127, 131, 137, 149, 151, 157, 167, 181, 197, 227, 233, 251, 281, 311, 313, 317, 331, 379, 383, 389, 397, 401, 409, 419, 449, 467, 479, 487, 499, 503, 557, 563, 569, 571, 577, 587, 647, 653, 701, 719, 733, 739, 751, 769, 809, 821, 823

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OFFSET

1,1

LINKS

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

Index entries for primes by primitive root

MATHEMATICA

pr=-21; Select[Prime[Range[200]], MultiplicativeOrder[pr, # ] == #-1 &]

CROSSREFS

Sequence in context: A252892 A256472 A330895 * A366692 A059799 A367796

Adjacent sequences: A105890 A105891 A105892 * A105894 A105895 A105896

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Apr 24 2005

STATUS

approved