a(n) = least positive integer > a(n-1) and not a(i)*a(j)-2 for 1<=i<=j<=n.

Terms

a(0) =2a(1) =3a(2) =5a(3) =6a(4) =9a(5) =11a(6) =12a(7) =14a(8) =15a(9) =17a(10) =18a(11) =19a(12) =21a(13) =24a(14) =27a(15) =29a(16) =30a(17) =33a(18) =35a(19) =37a(20) =38a(21) =39a(22) =41a(23) =42a(24) =44a(25) =45a(26) =47a(27) =48a(28) =50a(29) =51