Number of primes <= 13^n.

Terms

a(0) =0a(1) =6a(2) =39a(3) =327a(4) =3107a(5) =31616a(6) =337175a(7) =3715296a(8) =41913438a(9) =481269293a(10) =5602858280a(11) =65950014530a(12) =783308042567