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
Read a column of numbers and interpolate missing data
Remove white space from the string
Is it a number?
Min of a Matrix
Repeat copies of array elements
Find the maximum two numbers of every column of a matrix
Compute the intersect point of line and plan
Big Integer Sqrt
If the number is Narcissistic number
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