Prime factors of generalized Fermat numbers of the form 12^(2^m) + 1 with m >= 0.

Terms

a(0) =5a(1) =13a(2) =17a(3) =29a(4) =89a(5) =97a(6) =233a(7) =257a(8) =769a(9) =36097a(10) =40961a(11) =65537a(12) =81281a(13) =153953a(14) =163841a(15) =260753a(16) =1724417a(17) =4550657a(18) =5767169a(19) =8253953a(20) =11304961a(21) =13631489a(22) =21495809a(23) =69619841a(24) =77651969a(25) =147849217a(26) =158334977a(27) =159522817a(28) =1711276033a(29) =6528575489