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
Remove the polynomials that have positive real elements of their roots.
Whether the input is vector?
Multiply a column by a row
Dimensions of a rectangle
Return fibonacci sequence do not use loop and condition version 2
Find the maximum two numbers of every column of a matrix
Put m balls into n boxes (again)
Generate a vector like 1,2,2,3,3,3,4,4,4,4
Determine if input is a Narcissistic number
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