Divisors of 2^16 - 1.

Terms

a(0) =1a(1) =3a(2) =5a(3) =15a(4) =17a(5) =51a(6) =85a(7) =255a(8) =257a(9) =771a(10) =1285a(11) =3855a(12) =4369a(13) =13107a(14) =21845a(15) =65535