perl -le '$_=2;while($ARGV[0]-1){if(!($ARGV[0]%$_)){print$_ ;$ARGV[0]/=$_;}else{$_++}}' $1

##</code><code>##


$_=2;
while ($ARGV[0]-1) {
  if (!($ARGV[0]%$_)) {
    print $_ ;
    $ARGV[0]/=$_;
  } else {
    $_++
  }
}