Write a function that calculates the ratio between the sum of the prime numbers lower or equal than x, and the sum of the non-prime numbers lower than x.
Make a random, non-repeating vector.
subtract central cross
sum of first 'n' terms
03 - Matrix Variables 5
Length of the hypotenuse
Sum of a geometric series
Alternating 1´s and 0´s in a matrix
Get the mean digit
Ratio between sum of primes and sum of factors
Check if is a square
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