Cody Problem 656 deals with the totient function, denoted by phi(n) 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 Phi(n) is the sum of the values of phi(m) from m = 1 to n. Therefore, Phi(5) = 10.
Write a function to compute the totient summatory function.
Optional: determine the connection between the totient summatory function and the Farey sequence.
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