OFFSET
1,1
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 1..1000
MATHEMATICA
Select[Prime[Range[200]], MultiplicativeOrder[30, #] == # - 1 &]
Join[{11, 23}, Select[Prime[Range[200]], PrimitiveRoot[#, 30]==30&]] (* Harvey P. Dale, Sep 23 2018 *)
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
STATUS
approved