Integers that when prefixed by '3' and followed by '7' yield a prime.

Terms

a(0) =0a(1) =1a(2) =3a(3) =4a(4) =6a(5) =9a(6) =13a(7) =16a(8) =18a(9) =21a(10) =25a(11) =30a(12) =34a(13) =40a(14) =45a(15) =46a(16) =51a(17) =52a(18) =54a(19) =55a(20) =60a(21) =61a(22) =63a(23) =67a(24) =69a(25) =72a(26) =76a(27) =79a(28) =84a(29) =87