A071193 Least m>n such that the number of prime factors of m and n differ at least by 1.

2, 4, 4, 5, 6, 7, 8, 9, 11, 11, 12, 13, 14, 16, 16, 17, 18, 19, 20, 21, 23, 23, 24, 25, 27, 27, 29, 29, 30, 31, 32, 33, 36, 36, 36, 37, 38, 40, 40, 41, 42, 43, 44, 46, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 59, 59, 60, 61, 62, 63, 64