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.
first element of matrix
Double the next!
Alternating 1´s and 0´s in a matrix
Ratio between sum of primes and sum of factors
Say type of roots in quadratic equation
Approximate the inverse tangent by power series
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