Write a function that gives the mean digit (round towards nearest integer) of an input and positive number. For example:
x = 264 --> y = 4
x = 128 --> y = 4
Test Suite problem #4 has an incorrect value.
Test suite #4 is incorrect
Find the palindrome
Reverse the vector
Remove the two elements next to NaN value
Do Fast Fourier Transformation
Polite numbers. N-th polite number.
Approximate the inverse tangent by power series
Ratio between sum of primes and sum of factors
Sum of a geometric series
Check if is a square
Get the value 100
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