A019347 Primes with primitive root 20.

3, 13, 17, 23, 37, 43, 47, 53, 67, 73, 83, 103, 107, 113, 137, 157, 163, 167, 173, 223, 227, 233, 257, 263, 277, 283, 293, 313, 317, 337, 347, 353, 367, 383, 397, 433, 443, 463, 467, 487, 503, 547, 557, 563, 587, 593, 607, 613, 647, 653, 673, 677, 683, 727, 743, 773, 797

Offset: 1

Author

David W. Wilson

Keywords

• nonn

Links

• Vincenzo Librandi, Table of n, a(n) for n = 1..1000
• Index entries for primes by primitive root

Programs

Mathematica

pr=20; Select[Prime[Range[200]], MultiplicativeOrder[pr, # ] == #-1 &]
Join[{3,13,17},Select[Prime[Range[200]],PrimitiveRoot[#,20]==20&]] (* Harvey P. Dale, Mar 22 2019 *)