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Here is one of 68 characters in length:
sub p{my@x;map{my$c=$_;$_%$c||++$x[$_]for@_}@_=2..pop;grep$x[$_]==1,0. +.$#x}
UPDATE: And another of 65:
sub p{@_=2..pop;my$c;while($_[$c]){@_=($_[$c],grep$_%$_[$c],@_);$c++}@ +_}
UPDATE: And another of 60:
sub p{@_=2..pop;my$c;@_=($_[$c++],grep$_%$_[$c-1],@_)while$c<@_;@_}
UPDATE: And another of 40 (but I fear it strays from the rules...):
sub p{grep{my$c=$_;$#_==grep$c%$_,@_}@_=2..pop}

japhy -- Perl and Regex Hacker

In reply to Re: (Golf): Sieve of Eratosthenes by japhy
in thread (Golf): Sieve of Eratosthenes by tilly

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