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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 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
LINKS
MATHEMATICA
pr=-21; Select[Prime[Range[200]], MultiplicativeOrder[pr, # ] == #-1 &]
CROSSREFS
Sequence in context: A252892 A256472 A330895 * A366692 A059799 A367796
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Apr 24 2005
STATUS
approved

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Last modified August 29 11:28 EDT 2024. Contains 375516 sequences. (Running on oeis4.)