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Summing Euler’s Φ -function
Published online by Cambridge University Press: 01 August 2016
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Euler’s Φ(n) is the number of positive integers n with no factor in common with n. We wish to calculate
This problem arises in connection with the Farey series Fn, i.e. all the fractions from 0/1 to 1/1 (inclusive) with denominator n in their lowest terms, in order of size, so that for example
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