Why are there so many lines here? AFAIKS all you need is a hash, a sort and an array.

$counts{$_}++ for @array_of_numbers;
my @sorted_array = sort { $counts{$a} <=> $counts{$b} } keys %counts;
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Basically, go through the array and tally the occurances of numbers within a hash.
Finally sort the keys of the hash using a sort on the number or occurances.

Or have I missed something?

Amended: thanks to Molt ;)

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Brother Frankus.

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