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Vincenzo Librandi, Table of n, a(n) for n = 1..1000
pr=-31; Select[Prime[Range], MultiplicativeOrder[pr, # ] == #-1 &]
Sequence in context: A189483 A164952 A157977 * A045338 A250175 A038907
Adjacent sequences: A105900 A105901 A105902 * A105904 A105905 A105906
N. J. A. Sloane, Apr 24 2005