Smallest digit of n concatenated with largest digit of n is prime.

Terms

a(0) =11a(1) =13a(2) =17a(3) =19a(4) =20a(5) =23a(6) =29a(7) =30a(8) =31a(9) =32a(10) =37a(11) =47a(12) =50a(13) =59a(14) =67a(15) =70a(16) =71a(17) =73a(18) =74a(19) =76a(20) =79a(21) =89a(22) =91a(23) =92a(24) =95a(25) =97a(26) =98a(27) =102a(28) =103a(29) =105