Prime numbers prefixed with a '1'.

Terms

a(0) =12a(1) =13a(2) =15a(3) =17a(4) =111a(5) =113a(6) =117a(7) =119a(8) =123a(9) =129a(10) =131a(11) =137a(12) =141a(13) =143a(14) =147a(15) =153a(16) =159a(17) =161a(18) =167a(19) =171a(20) =173a(21) =179a(22) =183a(23) =189a(24) =197a(25) =1101a(26) =1103a(27) =1107a(28) =1109a(29) =1113