Divisors of 640.

Terms

a(0) =1a(1) =2a(2) =4a(3) =5a(4) =8a(5) =10a(6) =16a(7) =20a(8) =32a(9) =40a(10) =64a(11) =80a(12) =128a(13) =160a(14) =320a(15) =640