Divisors of 2^18 - 1.

Terms

a(0) =1a(1) =3a(2) =7a(3) =9a(4) =19a(5) =21a(6) =27a(7) =57a(8) =63a(9) =73a(10) =133a(11) =171a(12) =189a(13) =219a(14) =399a(15) =511a(16) =513a(17) =657a(18) =1197a(19) =1387a(20) =1533a(21) =1971a(22) =3591a(23) =4161a(24) =4599a(25) =9709a(26) =12483a(27) =13797a(28) =29127a(29) =37449