Numbers n such that 10^n - 99 is prime.

Terms

a(0) =4a(1) =5a(2) =7a(3) =27a(4) =91a(5) =248a(6) =347a(7) =501a(8) =535a(9) =767a(10) =2002a(11) =2581a(12) =2677a(13) =8158a(14) =15977a(15) =20666a(16) =23854a(17) =72730a(18) =86816