A069812 a(n)=sum(k=1,n,bigomega(k)-omega(k)).

0, 0, 0, 1, 1, 1, 1, 3, 4, 4, 4, 5, 5, 5, 5, 8, 8, 9, 9, 10, 10, 10, 10, 12, 13, 13, 15, 16, 16, 16, 16, 20, 20, 20, 20, 22, 22, 22, 22, 24, 24, 24, 24, 25, 26, 26, 26, 29, 30, 31, 31, 32, 32, 34, 34, 36, 36, 36, 36, 37, 37, 37, 38, 43, 43, 43, 43, 44, 44, 44, 44, 47, 47, 47, 48