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Exercise: Compute the result of φ(26).
By applying a combination of the facts about computing the Euler totient function φ for prime numbers, powers of primes, and products of coprime numbers, we can compute the solution as follows:
φ(26)
=
φ(2) ⋅ φ(13)
=
(2 − 1) ⋅(13 − 1)
=
12