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On common values of $\phi(n)$ and $\sigma(m)$, II
Euler’s function sum of divisors function totients
2011/1/17
For each positive-integer valued arithmetic function f, let Vf ⊂ N denote the image of f, and put Vf (x) := Vf ∩ [1, x] and Vf (x) := #Vf (x). Recently Ford, Luca, and Pomerance showed that V ∩...