The discussion and solutions at (Golf): Sieve of Eratosthenes may enlighten. The best "normal" answer was 47 characters: 
sub sieve {
  sub p{$_[0],@_>1?p(grep$_%$_[0],@_):()}p 2..pop
}

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In reply to Re: Sieve of Eratosthenes Golf? by tilly
in thread Sieve of Eratosthenes Golf? by Cody Pendant

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