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.
Project Euler: Problem 6, Natural numbers, squares and sums.
Calculate the area of a triangle between three points
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04 - Scalar Equations 3
Draw a 'N'!
Get the mean digit
Say type of roots in quadratic equation
Ratio between sum of primes and sum of factors
Sum of a geometric series
Approximate the inverse tangent by power series
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