Number of composites < 10^n.

Terms

a(0) =0a(1) =4a(2) =73a(3) =830a(4) =8769a(5) =90406a(6) =921500a(7) =9335419a(8) =94238543a(9) =949152464a(10) =9544947487a(11) =95881945185a(12) =962392087980