Shorthand of n-th smallest n-digit prime, see comments.

Terms

a(0) =2a(1) =3a(2) =7a(3) =21a(4) =61a(5) =69a(6) =117a(7) =189a(8) =193a(9) =181a(10) =259a(11) =193a(12) =303a(13) =411a(14) =487a(15) =513a(16) =931a(17) =591a(18) =861a(19) =667a(20) =801a(21) =1081a(22) =711a(23) =1027a(24) =1321a(25) =1753a(26) =1581a(27) =2109a(28) =1527a(29) =1951