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"... :-/
Sorted highest to lowest?
Flip the main diagonal of a matrix
Generate a string like abbcccddddeeeee
Is it a number?
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