Numbers k such that k prefixed by '4' and followed by '3' is prime.

Terms

a(0) =3a(1) =4a(2) =6a(3) =13a(4) =15a(5) =24a(6) =25a(7) =27a(8) =28a(9) =36a(10) =37a(11) =42a(12) =46a(13) =48a(14) =49a(15) =51a(16) =52a(17) =58a(18) =60a(19) =64a(20) =66a(21) =67a(22) =70a(23) =72a(24) =73a(25) =78a(26) =79a(27) =81a(28) =90a(29) =93