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.
Make a random, non-repeating vector.
Replicate elements in vectors
Square the input
Produce a sine wave
Get the mean digit
Check if is a square
Approximate the inverse tangent by power series
Alternating 1´s and 0´s in a matrix
Sum of a geometric series
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