Index of 6^n within the sequence of the numbers of the form 2^i*6^j.

Terms

a(0) =1a(1) =4a(2) =10a(3) =18a(4) =29a(5) =42a(6) =58a(7) =77a(8) =98a(9) =122a(10) =148a(11) =177a(12) =209a(13) =243a(14) =280a(15) =319a(16) =361a(17) =405a(18) =452a(19) =502a(20) =554a(21) =609a(22) =666a(23) =726a(24) =789a(25) =854a(26) =922a(27) =992a(28) =1065a(29) =1140