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Vincenzo Librandi, Table of n, a(n) for n = 1..1000
Index entries for primes by primitive root
pr=18; Select[Prime[Range], MultiplicativeOrder[pr, # ] == #-1 &]
Sequence in context: A243544 A141561 A240103 * A049489 A242383 A141785
Adjacent sequences: A019342 A019343 A019344 * A019346 A019347 A019348
David W. Wilson