I rearranged it a bit so you can just plug in your factor list and it will figure out what your number is. Note that in this case, the closest value is 5*7, but it returns 3*19.
use strict;
use warnings;
use List::Util qw[ reduce ];
my @pfs = ( 3,5,7,19 );
my $num = reduce { $a * $b } @pfs;
my $root = sqrt $num;
print "N=$num, R=$root\n";
#the rest is the same as you had it
Here's a fix:
use strict;
use warnings;
use List::Util qw[ reduce ];
my @pfs = ( 3,5,7,19 );
my $num = reduce { $a * $b } @pfs;
my $root = sqrt $num;
print "N=$num, R=$root\n";
my $near = reduce{
abs($root - $a * $b) < abs($root - $a) ? $a*$b : $a
} reverse @pfs;
print abs($root - $near) > abs($root - ($num/$near))
? $num/$near
: $near
;
Caution: Contents may have been coded under pressure.
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