The square sieve.

Terms

a(0) =2a(1) =5a(2) =8a(3) =12a(4) =17a(5) =22a(6) =28a(7) =34a(8) =41a(9) =48a(10) =56a(11) =65a(12) =74a(13) =84a(14) =94a(15) =105a(16) =116a(17) =128a(18) =140a(19) =153a(20) =166a(21) =180a(22) =194a(23) =209a(24) =224a(25) =240a(26) =257a(27) =274a(28) =292a(29) =310