Minimal set of prime-strings in base 10.

Terms

a(0) =2a(1) =3a(2) =5a(3) =7a(4) =11a(5) =19a(6) =41a(7) =61a(8) =89a(9) =409a(10) =449a(11) =499a(12) =881a(13) =991a(14) =6469a(15) =6949a(16) =9001a(17) =9049a(18) =9649a(19) =9949a(20) =60649a(21) =666649a(22) =946669a(23) =60000049a(24) =66000049a(25) =66600049