Monotonic ordering of nonnegative differences 5^i-4^j, for 40>= i>=0, j>=0.

Terms

a(0) =0a(1) =1a(2) =4a(3) =9a(4) =21a(5) =24a(6) =61a(7) =109a(8) =121a(9) =124a(10) =369a(11) =561a(12) =609a(13) =621a(14) =624a(15) =2101a(16) =2869a(17) =3061a(18) =3109a(19) =3121a(20) =3124a(21) =11529a(22) =12589a(23) =14601a(24) =15369a(25) =15561a(26) =15609a(27) =15621a(28) =15624a(29) =61741