A025712 Index of 6^n within sequence of numbers of form 2^i*6^j.

1, 4, 10, 18, 29, 42, 58, 77, 98, 122, 148, 177, 209, 243, 280, 319, 361, 405, 452, 502, 554, 609, 666, 726, 789, 854, 922, 992, 1065, 1140, 1218, 1299, 1382, 1468, 1556, 1647, 1741, 1837, 1936, 2037, 2141, 2247, 2356, 2468, 2582, 2699, 2818, 2940, 3065, 3192