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 dimensions of a matrix
Calculate area of sector
Given a square and a circle, please decide whether the square covers more area.
Alternate list of elements
Get the value 100
Double the next!
Approximate the inverse tangent by power series
Sum of a geometric series
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