Monotonic ordering of nonnegative differences 2^i-5^j, for 40>=i>=0, j>=0.

Terms

a(0) =0a(1) =1a(2) =3a(3) =7a(4) =11a(5) =15a(6) =27a(7) =31a(8) =39a(9) =59a(10) =63a(11) =103a(12) =123a(13) =127a(14) =131a(15) =231a(16) =251a(17) =255a(18) =387a(19) =399a(20) =487a(21) =507a(22) =511a(23) =759a(24) =899a(25) =971a(26) =999a(27) =1019a(28) =1023a(29) =1423