No need to populate values, though. 
    return sub {
        my $next = min keys %pool;
        @pool{ map { $next * $_ } @factor } = ();
        delete $pool{$next};
        return $next;
    };

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Caution: Contents may have been coded under pressure.

In reply to Re^2: Hamming Sequences and Lazy Lists by Roy Johnson
in thread Hamming Sequences and Lazy Lists by tall_man

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