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
Most nonzero elements in row
Back to basics 9 - Indexed References
Angle between two vectors
07 - Common functions and indexing 3
Put m balls into n boxes
Project Euler: Problem 14 Longest Collatz sequence(harder version)
If the number is Narcissistic number
Return fibonacci sequence do not use loop and condition version 2
Seperate array to small section according to its index position
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