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.
Determine the Anti-diagonal of a Magic Square
Matrix Construction I
Divisible by 2
Transpose the Matrix
Check if is a square
Get the mean digit
Sum of a geometric series
Say type of roots in quadratic equation
Double the next!
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