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.
give nth decimal place of pi
Back to basics 6 - Column Vector
Sum of diagonal of a square matrix
Output any real number that is neither positive nor negative
Sum of Two Numbers
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Check if is a square
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Get the mean digit
Ratio between sum of primes and sum of factors
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