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
Implement a ROT13 cipher
Is my wife right?
Replace multiples of 5 with NaN
Length of the hypotenuse
Seperate array to small section according to its index position
Return fibonacci sequence do not use loop and condition
Determine if input is a Narcissistic number
Put m balls into n boxes (again)
Find the right number make the equation
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