Divisors of 2^22 - 1.

Terms

a(0) =1a(1) =3a(2) =23a(3) =69a(4) =89a(5) =267a(6) =683a(7) =2047a(8) =2049a(9) =6141a(10) =15709a(11) =47127a(12) =60787a(13) =182361a(14) =1398101a(15) =4194303