Monotonic ordering of nonnegative differences 10^i-3^j, for 40>=i>=0, j>=0.

Terms

a(0) =0a(1) =1a(2) =7a(3) =9a(4) =19a(5) =73a(6) =91a(7) =97a(8) =99a(9) =271a(10) =757a(11) =919a(12) =973a(13) =991a(14) =997a(15) =999a(16) =3439a(17) =7813a(18) =9271a(19) =9757a(20) =9919a(21) =9973a(22) =9991a(23) =9997a(24) =9999a(25) =40951a(26) =80317a(27) =93439a(28) =97813a(29) =99271