z=120; y=$z; x=$z; 
until (( $[y--] < 3 )); do 
until (( $x <= $y || $[$x/$y] <= $y || $[(${x}0/$y)%10] != 0 )); do 
x=$[$x/$y]; 
echo $x $y $[$x/$y]
done; done; 
echo -e "\n"$[$z/$x] $x" \n"
factor 120 # correct result = 120: 2 2 2 3 5

x=$(($x/$y))

x=$((x / y))

((x /= y))

#!/bin/bash
x=${1:-120}
# Extra handling of divisor 2
until ((x % 2))
do
  echo 2
  ((x /= 2))
done
for ((y = 3; y <= x / y; y += 2))
do
  until ((x % y))
  do
    echo $y
    ((x /= y))
  done
done
((x > 2)) &&
  echo $x

z=120
d=2
while [ $(($d*$d)) -le $z ]; do
  while [ $(($z%$d)) -eq 0 ]; do
    echo -n $d ""
    z=$(($z/$d))
  done
  d=$(($d+1))
done
if [ $z -ne 1 ]; then
  echo -n $z
fi
echo