Monotonic ordering of nonnegative differences 7^i-2^j, for 40>=i>=0, j>=0.

Terms

a(0) =0a(1) =3a(2) =5a(3) =6a(4) =17a(5) =33a(6) =41a(7) =45a(8) =47a(9) =48a(10) =87a(11) =215a(12) =279a(13) =311a(14) =327a(15) =335a(16) =339a(17) =341a(18) =342a(19) =353a(20) =423a(21) =1377a(22) =1889a(23) =2145a(24) =2273a(25) =2337a(26) =2369a(27) =2385a(28) =2393a(29) =2397