Narcissistic number is a number that is the sum of its own digits each raised to the power of the number of digits.
153 = 1^3 + 5^3 + 3^3
101 ~= 1^3 + 0 ^3 + 1^3
Swap the first and last columns
Doubling elements in a vector
matrix of natural number
Equal to their cube
Find the regional maximum value
Determine if input is a perfect number
Find the maximum two numbers of every column of a matrix
Repeat copies of array elements
Generate a vector like 1,2,2,3,3,3,4,4,4,4
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