Numbers of the form (2^(i*j)-1)/((2^i-1)*(2^j-1)) where gcd(i,j) = 1.

Terms

a(0) =1a(1) =3a(2) =11a(3) =39a(4) =43a(5) =151a(6) =171a(7) =683a(8) =2255a(9) =2359a(10) =2731a(11) =9399a(12) =10923a(13) =43691a(14) =140911a(15) =149943a(16) =174763a(17) =549791a(18) =599479a(19) =699051a(20) =2796203a(21) =8727391a(22) =8965359a(23) =9588151a(24) =11184811a(25) =38350263a(26) =44739243a(27) =139090655a(28) =178956971a(29) =549687103