Monotonic ordering of nonnegative differences 7^i-3^j, for 40>= i>=0, j>=0.

Terms

a(0) =0a(1) =4a(2) =6a(3) =22a(4) =40a(5) =46a(6) =48a(7) =100a(8) =214a(9) =262a(10) =316a(11) =334a(12) =340a(13) =342a(14) =1672a(15) =2158a(16) =2320a(17) =2374a(18) =2392a(19) =2398a(20) =2400a(21) =10246a(22) =14620a(23) =16078a(24) =16564a(25) =16726a(26) =16780a(27) =16798a(28) =16804a(29) =16806