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Cannot make my program work correctly and will move to another project. I think I made some mistakes on some assumption but cannot figure it out. But I did learn a lot from this project. Learn the Fermat's theorem and know how to calculate large modulus on exponential, factorials, and combinations. Lots of trick on how to squeeze the performance.

I used brutal force to get the following results, hope they are helpful for you.

## Project Euler #172: Investigating numbers with few repeated digits

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Cannot make my program work correctly and will move to another project. I think I made some mistakes on some assumption but cannot figure it out. But I did learn a lot from this project. Learn the Fermat's theorem and know how to calculate large modulus on exponential, factorials, and combinations. Lots of trick on how to squeeze the performance.

I used brutal force to get the following results, hope they are helpful for you.