Near-repunit primes.

Terms

a(0) =101a(1) =113a(2) =131a(3) =151a(4) =181a(5) =191a(6) =211a(7) =311a(8) =811a(9) =911a(10) =1117a(11) =1151a(12) =1171a(13) =1181a(14) =1511a(15) =1811a(16) =2111a(17) =4111a(18) =8111a(19) =10111a(20) =11113a(21) =11117a(22) =11119a(23) =11131a(24) =11161a(25) =11171a(26) =11311a(27) =11411a(28) =16111a(29) =101111