123456789101112131415161718 |
- #!/usr/bin/perl
- # Very good asymptotic formula for Li(x), due to Cesaro.
- use 5.010;
- use strict;
- use warnings;
- use ntheory qw(factorial);
- my $x = 1e9;
- my $sum = 0;
- foreach my $n (1 .. log($x)) {
- $sum += factorial($n - 1) * $x / log($x)**$n;
- }
- say $sum; #=> 50849234.742179
|