a(n) = 10^n - prime(n).

Terms

a(0) =8a(1) =97a(2) =995a(3) =9993a(4) =99989a(5) =999987a(6) =9999983a(7) =99999981a(8) =999999977a(9) =9999999971a(10) =99999999969a(11) =999999999963