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.
surface of a spherical planet
Program an exclusive OR operation with logical operators
Area of square
Sum of a geometric series
Get the mean digit
Ratio between sum of primes and sum of factors
Approximate the inverse tangent by power series
Check if is a square
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