Least negative primitive root of n-th prime.

Terms

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