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".
Remove NaN ?
Generate a vector like 1,2,2,3,3,3,4,4,4,4
Add two numbers
The Answer to Life, the Universe, and Everything
Shift elements of vector left
Ratio between sum of primes and sum of factors
Alternate list of elements
Approximate the inverse tangent by power series
Say type of roots in quadratic equation
Get the mean digit
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