| r∈R i=1 References (2008) | |||||||||||||
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| mn = 1, − 1 where � ′ means that every term only occurs once (for example 1/15 = 1/(16 − 1) is only added once even though 16 = 4 2 = 2 4). Proof: Let R denote the set of all integers larger than 1 that are not perfect powers: R = | |||||||||||||
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