Numbers k such that k prefixed by '2' and followed by '9' is prime.

Terms

a(0) =2a(1) =3a(2) =6a(3) =12a(4) =17a(5) =23a(6) =26a(7) =30a(8) =33a(9) =38a(10) =39a(11) =45a(12) =53a(13) =54a(14) =57a(15) =60a(16) =65a(17) =68a(18) =69a(19) =71a(20) =72a(21) =74a(22) =78a(23) =81a(24) =87a(25) =90a(26) =93a(27) =96a(28) =99a(29) =101