Primes that divide Fibonacci number F(2^k) for some k.

Terms

a(0) =3a(1) =7a(2) =47a(3) =127a(4) =1087a(5) =2207a(6) =4481a(7) =21503a(8) =34303a(9) =119809a(10) =524287a(11) =65241089a(12) =167772161a(13) =1811939329a(14) =2147483647a(15) =3758096383a(16) =16074670081a(17) =73327699969a(18) =186812208641a(19) =206158430209