Small Basic - The Happy Number Challenge

As part of LitDev's December Challenges, Nonki suggested this Happy Number challenge:

"Calculate happy numbers below 1000."

Read more about Happy Numbers.

Math Man wasted no time in contributing this program:

Math Man's Happy Number Checker (click to try it out!)

Here is what it looks like (just an image):

Now that's a poor, sad number! Bonus points to Math Man for a little humor. =^)

What do you think of the challenge?

   - Tall Basic Ed