Smallest primitive prime factor of 12^n-1.

Terms

a(0) =11a(1) =13a(2) =157a(3) =5a(4) =22621a(5) =7a(6) =659a(7) =89a(8) =37a(9) =19141a(10) =23a(11) =20593a(12) =477517a(13) =211a(14) =61a(15) =17a(16) =2693651a(17) =1657a(19) =85403261a(21) =57154490053a(22) =47a(23) =193a(24) =303551a(25) =79a(26) =306829a(27) =673a(28) =59a(29) =31a(30) =373a(31) =153953