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.
test case #2 is not correct.
Find the sum of all the numbers of the input vector
Remove the vowels
Swap the input arguments
modulus of a number
Ratio between sum of primes and sum of factors
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Alternating 1´s and 0´s in a matrix
Sum of a geometric series
Check if is a square
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