A025645 Exponent of 4 (value of j) in n-th number of form 3^i*4^j.

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