J. Aust. Math. Soc.  82 (2007), 123-131
On the value set of the Carmichael $\lambda$-function

John B. Friedlander
  Department of Mathematics
  University of Toronto
  Toronto, Ontario M5S 3G3
  Canada
  frdlndr@math.toronto.edu
and
Florian Luca
  Instituto de Matemáticas
  Universidad Nacional Autónoma de México
  C.P. 58180, Morelia, Michoacán
  México
  fluca@matmor.unam.mx


Abstract
In this paper we study the size of the value set of the Carmichael $\lambda$-function.
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