A092849 Number of primes <= A092800(n).

2, 13, 87, 631, 4884, 39876, 336756, 2914140, 25683614, 229595323, 2075911061, 18944394204, 174219183788, 1612626081244, 15010195375589, 140387627837380, 1318553324421089, 12430152478650578, 117566893367826528, 1115249538463126642, 10607400237283187171, 101131327003506262770, 966289700136857769743

Offset: 1

Author

Enoch Haga, Mar 07 2004

Keywords

• nonn

Examples

			Below 10^1 there are 4 primes: 2 + 3 + 5 + 7 = 17. The rounded mean is 17/4 =~ 4. There are 2 primes less than 4: 2 and 3, so a(1) = 2.
		

Crossrefs

Cf. A092800, A092850, A092851.

Formula

a(n) = PrimePi(A092800(n)) = PrimePi(A046731(n)/A006880(n)). - Robert G. Wilson v, Jan 19 2007

Extensions

a(9)-a(13) from Robert G. Wilson v, Jan 19 2007

a(14)-a(23) from Amiram Eldar, Jun 14 2024