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 sum of all the numbers of the input vector
Sum all integers from 1 to 2^n
Generate a random matrix A of (1,-1)
sum of first 'n' terms
Approximate the inverse tangent by power series
Check if is a square
Get the value 100
Ratio between sum of primes and sum of factors
Sum of a geometric series
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