A025734 Index of 9^n within sequence of numbers of form 2^i*9^j.

1, 5, 12, 22, 35, 51, 71, 94, 120, 149, 181, 216, 255, 297, 342, 390, 441, 495, 553, 614, 678, 745, 815, 888, 965, 1045, 1128, 1214, 1303, 1395, 1491, 1590, 1692, 1797, 1905, 2016, 2131, 2249, 2370, 2494, 2621, 2751, 2885, 3022, 3162, 3305, 3451, 3600, 3753