A088739 Smallest semiprime divisor of n-th composite number.

4, 6, 4, 9, 10, 4, 14, 15, 4, 6, 4, 21, 22, 4, 25, 26, 9, 4, 6, 4, 33, 34, 35, 4, 38, 39, 4, 6, 4, 9, 46, 4, 49, 10, 51, 4, 6, 55, 4, 57, 58, 4, 62, 9, 4, 65, 6, 4, 69, 10, 4, 74, 15, 4, 77, 6, 4, 9, 82, 4, 85, 86, 87, 4, 6, 91, 4, 93, 94, 95, 4, 14, 9, 4, 6, 4, 15, 106, 4, 10, 111, 4