Legendre prime counting function

Seems like an awful lot of pointless work. Using prime sieve anyway, why not just use it?

use Math::Primesieve;

my $sieve = Math::Primesieve.new;

say "10^$_\t" ~ $sieve.count: exp($_,10) for ^10;

say (now - INIT now) ~ ' elapsed seconds';

Output:

10^0    0
10^1    4
10^2    25
10^3    168
10^4    1229
10^5    9592
10^6    78498
10^7    664579
10^8    5761455
10^9    50847534
0.071464489 elapsed seconds