11-rough numbers: not divisible by 2, 3, 5 or 7.

Terms

a(0) =1a(1) =11a(2) =13a(3) =17a(4) =19a(5) =23a(6) =29a(7) =31a(8) =37a(9) =41a(10) =43a(11) =47a(12) =53a(13) =59a(14) =61a(15) =67a(16) =71a(17) =73a(18) =79a(19) =83a(20) =89a(21) =97a(22) =101a(23) =103a(24) =107a(25) =109a(26) =113a(27) =121a(28) =127a(29) =131