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.
Check if number exists in vector
CONVERT TAN TO SIN
Try 1.5.4: Celsius to Fahrenheit
Sum of self power series
Vector Element Multiplication
Say type of roots in quadratic equation
Ratio between sum of primes and sum of factors
Double the next!
Get the mean digit
Alternate list of elements
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