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
Swap the first and last columns
Find the two most distant points
Prime factor digits
Find perfect placement of non-rotating dominoes (easier)
Add 3 numbers
Check if is a square
Ratio between sum of primes and sum of factors
Sum of a geometric series
Ratio between sum of primer numbers and non-prime numbers
Get the value 100
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