First download and install TweenMax.
You will be wanting this class anyway, so you might as well start learning how to use it now.
set up your stage in the following way.
Create the three movieclip symbols on the stage.
Instance names: “num1” “num2” "num3"
Stack them up so their center points are aligned.
Paste the following script into the actions layer on frame1.
The numbers should continue to cycle until you kill the function.
Tweak the speed of the cycle in the time and delay properties of the multiSequence.