Primes consisting of a single 1 and at least one copy of some other digit.

Terms

a(0) =13a(1) =17a(2) =19a(3) =31a(4) =41a(5) =61a(6) =71a(7) =199a(8) =313a(9) =331a(10) =661a(11) =881a(12) =919a(13) =991a(14) =1777a(15) =1999a(16) =2221a(17) =3313a(18) =3331a(19) =4441a(20) =6661a(21) =7177a(22) =7717a(23) =9199a(24) =31333a(25) =33331a(26) =71777a(27) =99991a(28) =199999a(29) =313333