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

Terms

a(0) =3a(1) =4a(2) =5a(3) =6a(4) =8a(5) =9a(6) =11a(7) =12a(8) =15a(9) =17a(10) =19a(11) =20a(12) =21a(13) =24a(14) =26a(15) =27a(16) =29a(17) =32a(18) =33a(19) =35a(20) =36a(21) =37a(22) =39a(23) =40a(24) =41a(25) =44a(26) =45a(27) =47a(28) =48a(29) =50