A number is perfect if it is equal to the sum of its factors, excluding itself.
The number 6 is perfect since its factors (other than 6) are 1, 2, and 3.
1 + 2 + 3 = 6
Return 1 for true (perfect), otherwise 0.
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"... :-/
CONVERT TAN TO SIN
Maximum value in a matrix
Concatenate two strings
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