This could be a fun post if several of you participate – so give this a whirl!

1) Take any four-digit number, using at least two different digits. (eg., 4013)

2) Arrange the digits in ascending and then in descending order to get two four-digit numbers, adding leading zeros if necessary. (eg., 0134 & 4310)

3) Subtract the smaller number from the bigger number. (eg., 4310 – 0134 = 4176)

4) Go back to step 2 with your new number from step 3 above.

Follow these steps in a loop until your answer from step 3 starts to repeat.  Write that repeating number as a comment to this post.

Go!