I don't even know why you need to use $chr() at all...

Code:
alias test {
  var %x = 1,%result
  while (%x <= 20) { var %result = %result %x | inc %x }
  echo -a %result
}


This alias will return:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20