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
NaN (欠損値) が含まれている行を削除しよう
Double the next!
Ratio between sum of primes and sum of factors
Sum of a geometric series
Ratio between sum of primer numbers and non-prime numbers
Approximate the inverse tangent by power series
Alternating 1´s and 0´s in a matrix
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