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Erdős problem 410

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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2415f78e850aeee50afdca525c6f2e0ea606f207
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