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
Matrix to column conversion
Min of a Matrix
length of a vector
Sum of a geometric series
Say type of roots in quadratic equation
Double the next!
Get the mean digit
Ratio between sum of primes and sum of factors
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