Odd prime factors of generalized Fermat numbers of the form 3^(2^m) + 1 with m >= 0.

A273945

Odd prime factors of generalized Fermat numbers of the form 3^(2^m) + 1 with m >= 0.

Terms

    a(0) =5a(1) =17a(2) =41a(3) =193a(4) =257a(5) =12289a(6) =59393a(7) =65537a(8) =275201a(9) =786433a(10) =790529a(11) =8972801a(12) =13631489a(13) =21523361a(14) =134382593a(15) =155189249a(16) =448524289a(17) =524455937a(18) =847036417a(19) =3221225473a(20) =12348030977a(21) =22320686081a(22) =77309411329a(23) =206158430209

External references