53 characters: 
sub sieve2 {
    grep{@_[map$a*$_,2..@_/($a=$_)]=0if$_[$_]>1}@_=0..pop
}

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   MeowChow                                   
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In reply to Re: (tye)Re2: (Golf): Sieve of Eratosthenes by MeowChow
in thread (Golf): Sieve of Eratosthenes by tilly

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