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.
Determine if input is odd
Roll the Dice!
Sum of odd numbers in a matrix
Matlab Basics II - Minimum
Sum of a geometric series
Get the mean digit
Alternate list of elements
Say type of roots in quadratic equation
Double the next!
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