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

Terms

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