A025713 Index of 6^n within sequence of numbers of form 3^i*6^j.

1, 3, 7, 12, 19, 28, 38, 50, 64, 79, 96, 114, 134, 156, 179, 204, 231, 259, 289, 320, 353, 388, 424, 462, 502, 543, 586, 631, 677, 725, 774, 825, 878, 932, 988, 1046, 1105, 1166, 1228, 1292, 1358, 1425, 1494, 1565, 1637, 1711, 1787, 1864, 1943, 2023, 2105, 2189