Unneeded variable declaration, 9 stroke penalty!
$x=pop;for(2..$x){$x{$_}||=0||do{$m=2*$_;{$x{$m}=1;($m+=$_)<=$x&&redo}}}grep!$x{$_},keys%x

In reply to Re^2: Sieve of Eratosthenes Golf? by cazz
in thread Sieve of Eratosthenes Golf? by Cody Pendant

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