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.
Project Euler: Problem 5, Smallest multiple
Switch matrix to a column vector
Remove the Zero
Matrix of almost all zeros, except for main diagonal
Convert from integer to binary
Alternate list of elements
Get the mean digit
Check if is a square
Sum of a geometric series
Double the next!
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