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.
How to subtract?
Determine if input is divisible by three.
Summation of array
Is it column vector?
Check if is a square
Double the next and alternate sign
Ratio between sum of primes and sum of factors
Sum of a geometric series
Double the next!
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