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.
Return the largest number that is adjacent to a zero
matrix of natural number
Add a row of zeros on top of a matrix
MATLAB Basic: rounding III
Sum of Two Numbers
Double the next and alternate sign
Sum of a geometric series
Get the value 100
Ratio between sum of primes and sum of factors
Check if is a square
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