a(1) = 1; for n > 1, a(n) = least positive prime primitive root of n-th prime.

Terms

a(0) =1a(1) =2a(2) =2a(3) =3a(4) =2a(5) =2a(6) =3a(7) =2a(8) =5a(9) =2a(10) =3a(11) =2a(12) =7a(13) =3a(14) =5a(15) =2a(16) =2a(17) =2a(18) =2a(19) =7a(20) =5a(21) =3a(22) =2a(23) =3a(24) =5a(25) =2a(26) =5a(27) =2a(28) =11a(29) =3