OFFSET
1,1
REFERENCES
A. M. Legendre, Essai sur la Théorie des Nombres, Paris: Duprat, 1808.
LINKS
Eric Weisstein's World of Mathematics, Legendre's Constant
Eric Weisstein's World of Mathematics, Prime Counting Function
Eric Weisstein's World of Mathematics, Prime Number Theorem
FORMULA
a(n) = round((10^n)/(log(10^n) - 1)).
EXAMPLE
a(2) = 28 because (10^2)/(log(10^2) - 1) = 27.7379415786....
MATHEMATICA
Table[Round[10^n/(Log[10^n] - 1)], {n, 20}]
PROG
(PARI) for(n=1, 20, print1(round(10^n/(log(10^n)-1)), ", "));
CROSSREFS
KEYWORD
nonn
AUTHOR
Arkadiusz Wesolowski, Aug 31 2013
STATUS
approved