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
Times 2 - START HERE
Sum of diagonal of a square matrix
Angle between Two Vectors
Return fibonacci sequence do not use loop and condition version 3
Solve Sudoku puzzle step by
Project Euler: Problem 14 Longest Collatz sequence(harder version)
Seperate array to small section according to its index position
Find the right number make the equation
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