Numbers k such that k prefixed by '7' and followed by '3' is prime.

Terms

a(0) =3a(1) =4a(2) =7a(3) =10a(4) =19a(5) =21a(6) =24a(7) =25a(8) =28a(9) =33a(10) =39a(11) =43a(12) =52a(13) =57a(14) =58a(15) =60a(16) =64a(17) =67a(18) =70a(19) =72a(20) =75a(21) =79a(22) =82a(23) =85a(24) =87a(25) =88a(26) =93a(27) =96a(28) =99a(29) =102