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.
Return the first and last character of a string
Change the sign of even index entries of the reversed vector
Who invented zero?
Product of elements in row
Finding an element in a vector
Sum of a geometric series
Alternating 1´s and 0´s in a matrix
Alternate list of elements
Say type of roots in quadratic equation
Double the next!
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