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Vincenzo Librandi, Table of n, a(n) for n = 1..1000
Index entries for primes by primitive root
pr=28; Select[Prime[Range], MultiplicativeOrder[pr, # ] == #-1 &]
Sequence in context: A246374 A040113 A003632 * A230288 A124662 A226614
Adjacent sequences: A019351 A019352 A019353 * A019355 A019356 A019357
David W. Wilson