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.
sum of non-primes
Output any real number that is neither positive nor negative
select the primes of a vector
subtract central cross
Alternating 1´s and 0´s in a matrix
Sum of a geometric series
Approximate the inverse tangent by power series
Double the next!
Say type of roots in quadratic equation
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