Index of 8^n within the sequence of the numbers of the form 8^i*9^j.

Terms

a(0) =1a(1) =2a(2) =4a(3) =7a(4) =11a(5) =16a(6) =22a(7) =29a(8) =37a(9) =46a(10) =56a(11) =67a(12) =79a(13) =92a(14) =106a(15) =121a(16) =137a(17) =154a(18) =172a(19) =190a(20) =209a(21) =229a(22) =250a(23) =272a(24) =295a(25) =319a(26) =344a(27) =370a(28) =397a(29) =425