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.
Find the largest value in the 3D matrix
Determine Whether an array is empty
Square a Number
Alternate list of elements
Ratio between sum of primes and sum of factors
Say type of roots in quadratic equation
Double the next!
Check if is a square
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