Ludic numbers: apply the same sieve as Eratosthenes, but cross off every k-th remaining number.

Terms

a(0) =1a(1) =2a(2) =3a(3) =5a(4) =7a(5) =11a(6) =13a(7) =17a(8) =23a(9) =25a(10) =29a(11) =37a(12) =41a(13) =43a(14) =47a(15) =53a(16) =61a(17) =67a(18) =71a(19) =77a(20) =83a(21) =89a(22) =91a(23) =97a(24) =107a(25) =115a(26) =119a(27) =121a(28) =127a(29) =131