Make a function which takes one positive integer n and returns a matrix with the numbers of the form (2^i)*(3^j)*(5^k) which are lower or equal to n (i,j,k integers).
Duplicate each element of a vector.
Multiply 2 numbers
Determine if input is a Narcissistic number
Is the input divisible by 3?
Maximum of ND-array
Iterative sum of digits of 2^n number
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