Smallest primitive prime factor of 6^n-1.

Terms

a(0) =5a(1) =7a(2) =43a(3) =37a(4) =311a(5) =31a(6) =55987a(7) =1297a(8) =19a(9) =11a(10) =23a(11) =13a(12) =3433a(13) =29a(14) =1171a(15) =17a(16) =239a(17) =46441a(18) =191a(19) =241a(20) =1822428931a(21) =51828151a(22) =47a(23) =1678321a(24) =18198701a(25) =53a(26) =163a(27) =421a(29) =1950271a(30) =5333