Divisors of 2^20 - 1.

Terms

a(0) =1a(1) =3a(2) =5a(3) =11a(4) =15a(5) =25a(6) =31a(7) =33a(8) =41a(9) =55a(10) =75a(11) =93a(12) =123a(13) =155a(14) =165a(15) =205a(16) =275a(17) =341a(18) =451a(19) =465a(20) =615a(21) =775a(22) =825a(23) =1023a(24) =1025a(25) =1271a(26) =1353a(27) =1705a(28) =2255a(29) =2325