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 and Forth Rows
Word Counting and Indexing
System of equations
Reindex a vector
Sum of the Matrix Elements
Find the right number make the equation
Repeat copies of array elements
Return fibonacci sequence do not use loop and condition version 2
Find the regional maximum value
Put m balls into n boxes (again)
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