a(n) = n*p where p is the next prime >= n.

Terms

a(0) =2a(1) =4a(2) =9a(3) =20a(4) =25a(5) =42a(6) =49a(7) =88a(8) =99a(9) =110a(10) =121a(11) =156a(12) =169a(13) =238a(14) =255a(15) =272a(16) =289a(17) =342a(18) =361a(19) =460a(20) =483a(21) =506a(22) =529a(23) =696a(24) =725a(25) =754a(26) =783a(27) =812a(28) =841a(29) =930