Testing it would have found
Name "main::n" used only once: possible typo at - line 5.
But besides that, ** is a more expensive operation than you need here
especially doing it 3 times per iteration.
in place of 2**$i
would be a bit faster.
my $i = 1;
(push @num, (($num & $i) ? 1 : 0)) and $i<<=1 until $i > $num;
is even better. And
(push @num, (($num & 1) ? 1 : 0)) and $num>>=1 until 1 > $num;
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