Prime factors of terms of A127263.

Terms

a(0) =3a(1) =19a(2) =571a(3) =9137a(4) =41113a(5) =174763a(6) =274081a(7) =1236787a(8) =7485811a(9) =23474953a(10) =34630009a(11) =47822393a(12) =69171211a(13) =92346689a(14) =160465489