Make a random, non-repeating vector.
Remove from a 2-D matrix all the rows that contain at least one element less than or equal to 4
Factorions: Numbers that equal the sum of the factorials of their digits
Given a matrix A return a vector of the product of the elements in each column using a loop without using prod.
Compute the perimeter of an ellipse
List the dihedral primes
List the emirps
Compute the nth term from the golden sieve
List the good primes
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