Monotonic ordering of nonnegative differences 9^i-5^j, for 40>= i>=0, j>=0.

Terms

a(0) =0a(1) =4a(2) =8a(3) =56a(4) =76a(5) =80a(6) =104a(7) =604a(8) =704a(9) =724a(10) =728a(11) =3436a(12) =5936a(13) =6436a(14) =6536a(15) =6556a(16) =6560a(17) =43424a(18) =55924a(19) =58424a(20) =58924a(21) =59024a(22) =59044a(23) =59048a(24) =140816a(25) =453316a(26) =515816a(27) =528316a(28) =530816a(29) =531316