Could you improve your test suite with more test cases? (e.g. 496, 28 (true) and 26, 500 (false))
I added some more tests.
See problem 1012.
The point "the sum of its factors" is not correct. it must be "the sum of all his divisors"... :-/
Back to basics 1 - Saving
Center of mass
Do Fast Fourier Transformation
Find the area of a rectangle if length of the diagonal is given.
Check that number is whole number
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