Binary sieve: delete every 2nd number, then every 4th, 8th, etc.

Terms

a(0) =1a(1) =3a(2) =5a(3) =9a(4) =11a(5) =13a(6) =17a(7) =21a(8) =25a(9) =27a(10) =29a(11) =33a(12) =35a(13) =37a(14) =43a(15) =49a(16) =51a(17) =53a(18) =57a(19) =59a(20) =65a(21) =67a(22) =69a(23) =73a(24) =75a(25) =77a(26) =81a(27) =85a(28) =89a(29) =91