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".
Determine if a Given Number is a Triangle Number
Duplicate each element of a vector.
Replacing a row
Cumulative product of a vector
Given a square and a circle, please decide whether the square covers more area.
Double the next!
Alternating 1´s and 0´s in a matrix
Check if is a square
Say type of roots in quadratic equation
Sum of a geometric series
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