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.
Find the two most distant points
Symmetry of vector
Sum of series II
find the surface area of a cube
Sum of adjacent elements in a vector
Get the mean digit
Say type of roots in quadratic equation
Sum of a geometric series
Approximate the inverse tangent by power series
Ratio between sum of primes and sum of factors
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