Let E denote the Euler totient; E(n) is the number of integers r =1,2,3,....., n
such that (r, n) = 1. Define S (n) as the sum of those E(n) integers.
Show that for n > 2, S (n) = n E(n) / 2.
such that (r, n) = 1. Define S (n) as the sum of those E(n) integers.
Show that for n > 2, S (n) = n E(n) / 2.
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