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A064151
Number of primes < n^n.
4
0, 2, 9, 54, 445, 4821, 65685, 1077871, 20700806, 455052511, 11262113374, 309787170203, 9373678643933, 309378125685426, 11059576578724264, 425656284035217743, 17547676024364306476, 771403526860478324343, 36020106660104388871845
OFFSET
1,2
FORMULA
a(n) = A000720(A000312(n)). - Michel Marcus, Aug 29 2014
PROG
(PARI) a(n) = primepi(n^n); \\ Michel Marcus, Apr 18 2018
CROSSREFS
Sequence in context: A127128 A353255 A254795 * A075679 A001757 A267225
KEYWORD
more,nonn
AUTHOR
Jason Earls, 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
a(19) from Chai Wah Wu, Apr 18 2018
STATUS
approved