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
Make a checkerboard matrix
Add two numbers
Remove all the words that end with "ain"
Triangle Numbers Below N
Whether the input is vector?
Return fibonacci sequence do not use loop and condition version 3
Determine if input is a Narcissistic number
Big Integer Sqrt
Put m balls into n boxes (again)
Find the maximum two numbers of every column of a matrix
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