Smallest primitive prime factor of 8^n-1.

Terms

a(0) =7a(1) =3a(2) =73a(3) =5a(4) =31a(5) =19a(6) =127a(7) =17a(8) =262657a(9) =11a(10) =23a(11) =37a(12) =79a(13) =43a(14) =631a(15) =97a(16) =103a(17) =87211a(18) =32377a(19) =41a(20) =92737a(21) =67a(22) =47a(23) =433a(24) =601a(25) =2731a(26) =2593a(27) =29a(28) =233a(29) =18837001