Numbers k such that k prefixed by '4' and followed by '1' is prime.

Terms

a(0) =0a(1) =2a(2) =3a(3) =6a(4) =9a(5) =11a(6) =20a(7) =21a(8) =23a(9) =24a(10) =26a(11) =27a(12) =39a(13) =42a(14) =44a(15) =45a(16) =48a(17) =56a(18) =59a(19) =62a(20) =65a(21) =69a(22) =72a(23) =75a(24) =80a(25) =83a(26) =86a(27) =87a(28) =93a(29) =95