The hyperexponentiation of a number
Sigh! Another lesson of not learning from the discussion thread.
This problem needs a little bit background knowledge. It is called Euler's theorem. I think it is fair to reveal such kind of information. Otherwise, how can one solve this problem?
I do not even know there is a problem like this. After I solved this problem, I totally forgot it. I lost my old code. I do not even know how I solved it. Now I am trying to solve it again. I immediately realized how to solve it since I had experienced a hard time to solve problem 282: the Ackermann function. If I learned from problem 188, 282 is trivial.
Why 3390 people solved this problem but only 560 people solved problem 282? So many people left from project euler?
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