Numbers congruent to 1 or 5 mod 6.

Terms

a(0) =1a(1) =5a(2) =7a(3) =11a(4) =13a(5) =17a(6) =19a(7) =23a(8) =25a(9) =29a(10) =31a(11) =35a(12) =37a(13) =41a(14) =43a(15) =47a(16) =49a(17) =53a(18) =55a(19) =59a(20) =61a(21) =65a(22) =67a(23) =71a(24) =73a(25) =77a(26) =79a(27) =83a(28) =85a(29) =89