Problem 60516. Compute the totient summatory function
Cody Problem 656 deals with the totient function, denoted by
which counts the numbers less than n that are relatively prime to n. The first five values of the totient are 1, 1, 2, 2, and 4.
The totient summatory function
is the sum of the values of
from
to n. Therefore,
.
Write a function to compute the totient summatory function.
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