A025736 Index of 9^n within sequence of numbers of form 6^i*9^j.

1, 3, 6, 10, 15, 22, 30, 39, 49, 61, 74, 88, 103, 119, 137, 156, 176, 197, 220, 244, 269, 295, 322, 351, 381, 412, 444, 478, 513, 549, 586, 625, 665, 706, 748, 791, 836, 882, 929, 977, 1027, 1078, 1130, 1183, 1237, 1293, 1350, 1408, 1467, 1528, 1590, 1653, 1717