You're right. But why so much work? A trivial modification to my code will do that.
sub fact7b {
my @factor = map Math::BigInt->new($_), (2 .. shift);
while(@factor > 1) {
my @pair = splice @factor, 0, @factor / 2;
$_ = $_ * pop @pair for @factor[0..$#pair];
}
return shift @factor;
}
Update: doh, fixed overly clever, broken code. ( s{1 + $#factor / 2}{@factor / 2})
Makeshifts last the longest.
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