Number of semiprimes with n digits.

Terms

a(0) =3a(1) =31a(2) =265a(3) =2326a(4) =20753a(5) =186657a(6) =1694289a(7) =15522934a(8) =143361278a(9) =1332987907a(10) =12466213899a(11) =117166026836