

A064151


Number of primes < n^n.


3



0, 2, 9, 54, 445, 4821, 65685, 1077871, 20700806, 455052511, 11262113374, 309787170203, 9373678643933, 309378125685426, 11059576578724264, 425656284035217743, 17547676024364306476, 771403526860478324343
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OFFSET

1,2


LINKS

Table of n, a(n) for n=1..18.
Index entries for sequences related to numbers of primes in various ranges
Tomás Oliveira e Silva, Tables of values of pi(x) and of pi2(x) [From Donovan Johnson, Oct 14 2010]


FORMULA

a(n) = A000720(A000312(n)).  Michel Marcus, Aug 29 2014


CROSSREFS

Sequence in context: A222014 A127128 A254795 * A075679 A001757 A078455
Adjacent sequences: A064148 A064149 A064150 * A064152 A064153 A064154


KEYWORD

more,nonn


AUTHOR

Jason Earls (zevi_35711(AT)yahoo.com), Sep 13 2001


EXTENSIONS

a(13)a(15) from Donovan Johnson, Oct 14 2010
a(16) from Jens Kruse Andersen, Jul 29 2014
a(17)a(18) from Henri Lifchitz, Aug 29 2014


STATUS

approved



