test case #2 is not correct.
The problem description should be change to "and the sum of non-prime numbers up to the greatest prime lower than x".
Thank you for that clarification, @Rafael S.T. Vieira. The problem title and description have been improved, along with added test cases.
radius of a spherical planet
Fibonacci-Sum of Squares
Evaluating a polynomial
Flip the vector from right to left
Double the next!
Alternating 1´s and 0´s in a matrix
Sum of a geometric series
Get the mean digit
Say type of roots in quadratic equation
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