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
Back to basics 18 - justification
Return elements unique to either input
07 - Common functions and indexing 1
Compute the intersect point of line and plan
Put m balls into n boxes
Make an anonymous function that has variable output
Seperate array to small section according to its index position
Repeat copies of array elements
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