A082879 Number of primes not exceeding factorial of n-th prime.

1, 3, 30, 675, 2428956, 289620751, 10953617995740, 3175094503778521

Offset

1,2

Links

Table of n, a(n) for n=1..8.

Tomás Oliveira e Silva, Tables of values of pi(x) and of pi2(x) [From Donovan Johnson, Feb 18 2010]

Formula

a(n)=A000720[A000142[A000040(n)]]

Mathematica

Table[PrimePi[Prime[j]! ], {j, 1, 6}]

Crossrefs

Cf. A000720, A000142, A000040.

Sequence in context: A007019 A327021 A186941 * A012007 A065753 A255926

Adjacent sequences: A082876 A082877 A082878 * A082880 A082881 A082882

Keyword

easy,nonn

Author

Labos Elemer, Apr 16 2003

Extensions

a(7) from Donovan Johnson, Dec 15 2009

a(8) from Donovan Johnson, Feb 18 2010

Status

approved