A025640 Exponent of 3 (value of i) in n-th number of form 3^i*4^j.

0, 1, 0, 2, 1, 0, 3, 2, 1, 0, 4, 3, 2, 1, 5, 0, 4, 3, 2, 6, 1, 5, 0, 4, 3, 7, 2, 6, 1, 5, 0, 4, 8, 3, 7, 2, 6, 1, 5, 0, 9, 4, 8, 3, 7, 2, 6, 1, 10, 5, 0, 9, 4, 8, 3, 7, 2, 11, 6, 1, 10, 5, 0, 9, 4, 8, 3, 12, 7, 2, 11, 6, 1, 10, 5, 0, 9, 4, 13, 8, 3, 12, 7, 2, 11, 6, 1, 10, 5, 0, 14, 9, 4, 13, 8, 3, 12, 7, 2, 11, 6