Smallest prime dividing 12^n + 1.

Terms

a(0) =2a(1) =13a(2) =5a(3) =7a(4) =89a(5) =13a(6) =5a(7) =13a(8) =17a(9) =7a(10) =5a(11) =13a(12) =89a(13) =13a(14) =5a(15) =7a(16) =153953a(17) =13a(18) =5a(19) =13a(20) =41a(21) =7a(22) =5a(23) =13a(24) =17a(25) =13a(26) =5a(27) =7a(28) =89a(29) =13