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) =7a(5) =8a(6) =9a(7) =11a(8) =12a(9) =14a(10) =15a(11) =17a(12) =20a(13) =21a(14) =23a(15) =24a(16) =27a(17) =29a(18) =32a(19) =35a(20) =36a(21) =37a(22) =39a(23) =41a(24) =44a(25) =45a(26) =47a(27) =48a(28) =50a(29) =51