A086770 Largest prime divisor of n - smallest prime divisor of n = number of prime divisors of n (counted with multiplicity).

1, 15, 20, 30, 35, 50, 112, 143, 168, 189, 252, 280, 315, 323, 378, 392, 420, 441, 525, 588, 630, 700, 735, 882, 899, 980, 1029, 1050, 1372, 1470, 1750, 1763, 2058, 2450, 2816, 3430, 3599, 3773, 4224, 4802, 5183, 5929, 6336, 7040, 9317, 9504, 9856, 10403