Index of 2^n within sequence of numbers of form 2^i*3^j (A003586).

Terms

a(0) =1a(1) =2a(2) =4a(3) =6a(4) =9a(5) =13a(6) =17a(7) =22a(8) =28a(9) =34a(10) =41a(11) =48a(12) =56a(13) =65a(14) =74a(15) =84a(16) =95a(17) =106a(18) =118a(19) =130a(20) =143a(21) =157a(22) =171a(23) =186a(24) =202a(25) =218a(26) =235a(27) =253a(28) =271a(29) =290