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Vincenzo Librandi, Table of n, a(n) for n = 1..1000
pr=-5; Select[Prime[Range], MultiplicativeOrder[pr, # ] == #-1 &]
Sequence in context: A103336 A019402 A038927 * A173638 A018420 A253474
Adjacent sequences: A105874 A105875 A105876 * A105878 A105879 A105880
N. J. A. Sloane, Apr 24 2005