Numbers k such that k prefixed by '5' and followed by '9' is prime.

Terms

a(0) =0a(1) =6a(2) =9a(3) =11a(4) =17a(5) =18a(6) =20a(7) =27a(8) =30a(9) =39a(10) =41a(11) =44a(12) =47a(13) =51a(14) =56a(15) =63a(16) =65a(17) =66a(18) =68a(19) =74a(20) =77a(21) =83a(22) =84a(23) =86a(24) =87a(25) =93a(26) =105a(27) =110a(28) =116a(29) =119