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Erdős problem 694

Let Unparsed notation: f_\max(n) be the largest mm such that ϕ(m)=n\phi(m) = n, and Unparsed notation: f_\min(n) be the smallest such mm, where ϕ\phi is Euler's totient function. Investigate Unparsed notation: \max_{n\leq x}\frac{f_\max(n)}{f_\min(n)}.

Erdős Problems records this as solved (Lean).

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How far the record reaches4 of 6 stages
  1. Sourceerdos-problems
  2. StatementRetained
  3. Formal3 retained
  4. Resolutionsolved (Lean)
  5. WorkNone recorded
  6. DecisionNone here
  7. The questionNot reached
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Where the source files it575 share a topic
Erdős problem 321accepted
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