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.
Return the largest number that is adjacent to a zero
Find the two most distant points
Project Euler: Problem 7, Nth prime
Change matrix to vector
Approximate the inverse tangent by power series
Get the mean digit
Ratio between sum of primes and sum of factors
Check if is a square
Sum of a geometric series
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