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Vincenzo Librandi, Table of n, a(n) for n = 1..1000
pr=-9; Select[Prime[Range], MultiplicativeOrder[pr, # ] == #-1 &]
Sequence in context: A260889 A040154 A166862 * A060191 A178899 A023393
Adjacent sequences: A105878 A105879 A105880 * A105882 A105883 A105884
N. J. A. Sloane, Apr 24 2005