Primes with primitive root 20.

Terms

a(0) =3a(1) =13a(2) =17a(3) =23a(4) =37a(5) =43a(6) =47a(7) =53a(8) =67a(9) =73a(10) =83a(11) =103a(12) =107a(13) =113a(14) =137a(15) =157a(16) =163a(17) =167a(18) =173a(19) =223a(20) =227a(21) =233a(22) =257a(23) =263a(24) =277a(25) =283a(26) =293a(27) =313a(28) =317a(29) =337