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
Try 1.5.4: Celsius to Fahrenheit
Number of digits in an integer
06 - Matrix Equations 1
Length of a short side
Return fibonacci sequence do not use loop and condition version 2
Compute the intersect point of line and plan
Big Integer Sqrt
Find the right number make the equation
Put m balls into n boxes
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