Number of composites <= 10^n.

Terms

a(0) =0a(1) =5a(2) =74a(3) =831a(4) =8770a(5) =90407a(6) =921501a(7) =9335420a(8) =94238544a(9) =949152465a(10) =9544947488a(11) =95881945186a(12) =962392087981