Enter a whole number up to 999,999.
Click "Go!" to see your number and the next number. Keep clicking "Go!" to get more numbers.
Click "Reset" to start with a new number. (Or just type a new number in the box and click "Go!".)
(This program is easy to break. It won't complain if you enter things that aren't whole numbers or enter numbers that are too big... but it won't work either. Play nice.)