Index of 3^n within the sequence of the numbers of the form 3^i*6^j.

Terms

a(0) =1a(1) =2a(2) =4a(3) =6a(4) =9a(5) =13a(6) =17a(7) =22a(8) =27a(9) =33a(10) =40a(11) =47a(12) =55a(13) =63a(14) =72a(15) =82a(16) =92a(17) =103a(18) =115a(19) =127a(20) =140a(21) =153a(22) =167a(23) =182a(24) =197a(25) =213a(26) =229a(27) =246a(28) =264a(29) =282