a(n) = prime(n) + 1.

Terms

a(0) =3a(1) =4a(2) =6a(3) =8a(4) =12a(5) =14a(6) =18a(7) =20a(8) =24a(9) =30a(10) =32a(11) =38a(12) =42a(13) =44a(14) =48a(15) =54a(16) =60a(17) =62a(18) =68a(19) =72a(20) =74a(21) =80a(22) =84a(23) =90a(24) =98a(25) =102a(26) =104a(27) =108a(28) =110a(29) =114