Prime factors of generalized Fermat numbers of the form 6^(2^m) + 1 with m >= 0.

Terms

a(0) =7a(1) =17a(2) =37a(3) =257a(4) =353a(5) =1297a(6) =1697a(7) =2753a(8) =18433a(9) =65537a(10) =80897a(11) =98801a(12) =145601a(13) =763649a(14) =3360769a(15) =4709377a(16) =13631489a(17) =50307329a(18) =376037377a(19) =2483027969a(20) =3191106049a(21) =4926056449a(22) =51808043009a(23) =152605556737a(24) =916326983681