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.
Are you in XY plane?
length of a vector
Create a square matrix of zeros of even order
Alternate list of elements
Double the next!
Get the mean digit
Double the next and alternate sign
Ratio between sum of primes and sum of factors
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