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

Terms

a(0) =1a(1) =3a(2) =4a(3) =7a(4) =8a(5) =12a(6) =13a(7) =16a(8) =17a(9) =20a(10) =21a(11) =24a(12) =25a(13) =28a(14) =29a(15) =32a(16) =33a(17) =36a(18) =37a(19) =40a(20) =43a(21) =44a(22) =47a(23) =48a(24) =52a(25) =55a(26) =56a(27) =59a(28) =60a(29) =63