Largest n-digit number coprime to n.

Terms

a(0) =9a(1) =99a(2) =998a(3) =9999a(4) =99999a(5) =999997a(6) =9999999a(7) =99999999a(8) =999999998a(9) =9999999999a(10) =99999999999a(11) =999999999997