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.
Specific Element Count
Double the next!
Check if is a square
Say type of roots in quadratic equation
Ratio between sum of primes and sum of factors
Sum of a geometric series
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