a(n) = least positive integer > a(n-1) and not of form a(i)*a(j)*a(k) for 1<=i<=j<=k<n.

Terms

a(0) =1a(1) =2a(2) =3a(3) =5a(4) =7a(5) =11a(6) =13a(7) =16a(8) =17a(9) =19a(10) =23a(11) =24a(12) =29a(13) =31a(14) =36a(15) =37a(16) =40a(17) =41a(18) =43a(19) =47a(20) =53a(21) =54a(22) =56a(23) =59a(24) =60a(25) =61a(26) =67a(27) =71a(28) =73a(29) =79