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Erdős problem 410

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Let σ1(n)=σ(n)σ_1(n) = σ(n), the sum of divisors function, and σk(n)=σ(σk−1(n))σ_k(n) = σ(σ_{k-1}(n)).

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  3. Formal1 retained
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Number Theory576Iterated Functions9
Erdős problem 321accepted
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