Smallest prime == -1 (mod n).

Terms

a(0) =2a(1) =3a(2) =2a(3) =3a(4) =19a(5) =5a(6) =13a(7) =7a(8) =17a(9) =19a(10) =43a(11) =11a(12) =103a(13) =13a(14) =29a(15) =31a(16) =67a(17) =17a(18) =37a(19) =19a(20) =41a(21) =43a(22) =137a(23) =23a(24) =149a(25) =103a(26) =53a(27) =83a(28) =173a(29) =29