An Intriguing Number Pattern Problem

Somebody forwarded this math puzzle several days ago. Believe me it is quite challenging, especially for the math majors.  🙂  To those who want to exercise their brain muscles, you may want to check this out.

8809=6
7111=0
2172=0
6666=4
1111=0
3213=0
7662=2
9313=1
0000=4
2222=0
3333=0
5555=0
8193=3
8096=5
7777=0
9999=4
7756=1
6855=3
9881=5
5531=0
2581=?

By the way, please don’t post the answer.

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8 thoughts on “An Intriguing Number Pattern Problem

  1. After spending 10 minutes messing aroud with the numbers on excel I now have two options: I can either leave it be now or probably spend a good few hours on it.

    Of course I will take neither option and let it linger in my mind for the next few days without any thorough mathematical analysis. Then again, past experience tells me that there’s a high liklihood that it’s one of those problems that requires a different persepective, not a thorough analysis.

    I’m now spending time thinking what to do, when I could simply be getting on with it!

  2. I don’t like the use of equals signs in this puzzle. That gives a false impression; 8809 does not equal 6 in this puzzle. It would be better to say 8809 –> 6, 7111 –> 0, etc. I think the equals sign in misleading, not to mention wrong.

    And, Guillermo, I used a VERY mathematical method to solve this problem. Wasn’t till after I completed my solution that I saw the not very mathematical method to which you refer.

    • Hi Patrick. What you say is really true. In fact, it was one of the reasons why it took me a long time to solve it. I should have changed it. Anyway, with that use of the equal sign, it is likely that the creator of the puzzle is not mathematically inclined.

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