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.
Replace NaNs with the number that appears to its left in the row.
06 - Matrix Equations 1
Sum of integers numbers
Convert yards to feet
Get the mean digit
Double the next!
Check if is a square
Alternate list of elements
Get the value 100
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