Numbers k such that 9*k - 4 is prime.

Terms

a(0) =1a(1) =3a(2) =5a(3) =7a(4) =13a(5) =15a(6) =17a(7) =19a(8) =27a(9) =29a(10) =33a(11) =35a(12) =39a(13) =43a(14) =45a(15) =47a(16) =55a(17) =57a(18) =63a(19) =67a(20) =69a(21) =73a(22) =83a(23) =85a(24) =89a(25) =99a(26) =105a(27) =109a(28) =113a(29) =115