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.
How many jokers?
Alternate list of elements
Check if is a square
Get the mean digit
Alternating 1´s and 0´s in a matrix
Ratio between sum of primes and sum of factors
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