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

Comments (10)
  1. Math Man says:

    I thought it was a good challenge because the check for happy numbers was recursive, so we had to be able to contain that recursion while still providing the correct answer to whether that was a happy number or not. The 6 smallest happy numbers are 1, 7, 10, 13, 19, and 23.

  2. Math Man says:

    Please note, however, that if you enter '0' in the text box, it will crash. I will fix that as soon as I can.

  3. Math Man says:

    Ed, can you update the program link to It just contains a minor bug fix. Thanks.

  4. Math Man says:

    Sorry, when I put the link at the end of the sentence, it thought the question mark was part of the link. Here's the link:

  5. Math Man, I updated the link.


  6. Ha, Ha, Ha

    21122012 – End Of World – is Happy.

    There is not going to be an end of world. 🙂

  7. @Math Man,

    You could do this app easier. Every digit is an character and the Text.SubString() for every character in text string: power up twice x * x and add to accumulator. Repeat, until accumulator is >=0 and <9. If accumulator = 1: happy, other: sad.

    accum = 0

    string = …

    for every charcter in string

           accum = accum + (character * character)

    '''''''''''''''' a character is a single digit, so only it's lenght is 1.

    end for every

    string = accum (Small Basic will make a string out of accum)

    if accum > 9

            repeat from the beginning, preserve the string


    if accum < 9  then

           if accum = then

                        -> HAPPY





  8. Math Man says:

    @ logic thinker

    Yes. That is actually kind of what I did.

  9. @Math Man

    Of course, I didn't mean to teach You. 🙂

    But I just wanted to mention that the problem about determining happy numbers is to repeat an action on a sequence until the length of items making the sequence = 1.

    Happy Holidays!

  10. Logic Thinker,

    You said, "There is not going to be an end of world."

    Well, if it ended, would you know you were wrong? =^)

    Thanks to both of you. Good discussion.

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