Zur Dichte der Menge der vollkommenen Zahlen

@article{Hornfeck1955ZurDD,
  title={Zur Dichte der Menge der vollkommenen Zahlen},
  author={Bernhard Hornfeck},
  journal={Archiv der Mathematik},
  year={1955},
  volume={6},
  pages={442-443}
}

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The fun&ions f(m) and 4(m) are called additive and multiplicative respectively if they are defined for non-negative integers m, and if, for (ml, m,) = 1, fhm,) =f(W+fhL In my paper " On the density