A perfect number occurs whent the sum of all divisors of a positive integer, except the number itself, equals the number.
28 = 1 + 2 + 4 + 7 + 14;
so return true
10 ~= 1 + 2 + 5
so return false
Add two numbers
Return the Fibonacci Sequence
Change the sign of even index entries of the reversed vector
Who invented zero?
Find the maximum two numbers of every column of a matrix
Find the right number make the equation
Return fibonacci sequence do not use loop and condition
Put m balls into n boxes (again)
Repeat copies of array elements
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