OFFSET
1,1
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 1..1000
MATHEMATICA
pr=-9; Select[Prime[Range[200]], MultiplicativeOrder[pr, # ] == #-1 &]
CROSSREFS
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Apr 24 2005
STATUS
approved