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.
Factorize THIS, buddy
The Hitchhiker's Guide to MATLAB
Back to basics 14 - Keywords
Sum of the Matrix Elements
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