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Vincenzo Librandi, Table of n, a(n) for n = 1..1000
pr=-20; Select[Prime[Range], MultiplicativeOrder[pr, # ] == #-1 &]
Sequence in context: A052031 A166009 A240107 * A111337 A185104 A240570
Adjacent sequences: A105889 A105890 A105891 * A105893 A105894 A105895
N. J. A. Sloane, Apr 24 2005