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 series III
Matlab Basics - Rounding I
Basic commands - Greatest common divisor
Reverse the Matrix
Approximate the inverse tangent by power series
Ratio between sum of primes and sum of factors
Get the mean digit
Sum of a geometric series
Double the next!
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