The smaller member of a near-repdigit emirp pair.

Terms

a(0) =113a(1) =199a(2) =337a(3) =1151a(4) =1181a(5) =3343a(6) =3373a(7) =7177a(8) =7577a(9) =11161a(10) =77797a(11) =98999a(12) =111119a(13) =111211a(14) =323333a(15) =333337a(16) =333433a(17) =777787a(18) =777877a(19) =991999a(20) =1111711a(21) =3333373a(22) =9929999a(23) =11111117a(24) =11111911a(25) =11113111