Primes of the form 6k-1.

Terms

a(0) =5a(1) =11a(2) =17a(3) =23a(4) =29a(5) =41a(6) =47a(7) =53a(8) =59a(9) =71a(10) =83a(11) =89a(12) =101a(13) =107a(14) =113a(15) =131a(16) =137a(17) =149a(18) =167a(19) =173a(20) =179a(21) =191a(22) =197a(23) =227a(24) =233a(25) =239a(26) =251a(27) =257a(28) =263a(29) =269