Number of primes < 3^prime(n).A086692Number of primes < 3^prime(n).Terms a(0) =4a(1) =9a(2) =53a(3) =327a(4) =16097a(5) =120739a(6) =7332159a(7) =58648288a(8) =3886548158External referencesoeis: A086692