a(n) = Sum_{k = 1..n} floor(n/prime(k)^3).

Terms

a(0) =0a(1) =0a(2) =0a(3) =0a(4) =0a(5) =0a(6) =0a(7) =1a(8) =1a(9) =1a(10) =1a(11) =1a(12) =1a(13) =1a(14) =1a(15) =2a(16) =2a(17) =2a(18) =2a(19) =2a(20) =2a(21) =2a(22) =2a(23) =3a(24) =3a(25) =3a(26) =4a(27) =4a(28) =4a(29) =4