OFFSET
1,1
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 1..1000
MATHEMATICA
pr=23; Select[Prime[Range[200]], MultiplicativeOrder[pr, # ] == #-1 &]
Join[{2, 3, 5, 17}, Select[Prime[Range[200]], PrimitiveRoot[#, 23]==23&]] (* Harvey P. Dale, Jan 09 2024 *)
PROG
(PARI) is(n)=isprime(n) && n!=23 && znorder(Mod(23, n))==n-1 \\ Charles R Greathouse IV, Sep 28 2015
CROSSREFS
KEYWORD
nonn
AUTHOR
STATUS
approved