Smallest prime dividing 6^n + 1.

Terms

a(0) =2a(1) =7a(2) =37a(3) =7a(4) =1297a(5) =7a(6) =13a(7) =7a(8) =17a(9) =7a(10) =37a(11) =7a(12) =1297a(13) =7a(14) =37a(15) =7a(16) =353a(17) =7a(18) =13a(19) =7a(20) =41a(21) =7a(22) =37a(23) =7a(24) =17a(25) =7a(26) =37a(27) =7a(28) =281a(29) =7