Scan n from left to right once, erasing any primes.

Terms

a(0) =1a(1) =0a(2) =0a(3) =4a(4) =0a(5) =6a(6) =0a(7) =8a(8) =9a(9) =10a(10) =0a(11) =1a(12) =0a(13) =14a(14) =1a(15) =16a(16) =0a(17) =18a(18) =0a(19) =0a(20) =1a(21) =0a(22) =0a(23) =4a(24) =0a(25) =6a(26) =0a(27) =8a(28) =0a(29) =0