A025697 Index of 3^n within sequence of numbers of form 3^i*6^j.

1, 2, 4, 6, 9, 13, 17, 22, 27, 33, 40, 47, 55, 63, 72, 82, 92, 103, 115, 127, 140, 153, 167, 182, 197, 213, 229, 246, 264, 282, 301, 321, 341, 362, 383, 405, 428, 451, 475, 499, 524, 550, 576, 603, 630, 658, 687, 716, 746, 777, 808, 840, 872, 905, 939, 973, 1008, 1043