Sum of squares of unitary divisors
Easiest problem in 2013. I take a look at the problem and find out it is extremely easy. No wonder 470+ people have already solved it. I wrote the code in 15 minutes and it is solved! I should admit that I used a few of my functions wrote for other problems. Without those functions, I will need a little bit more time.
Try it, it is easy. Everyone feels happy to solve this problem!
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