Geodesic
On the distribution of perfect totients
Journal of integer sequences, Tome 9 (2006) no. 4.

Voir la notice de l'article provenant de la source Electronic Library of Mathematics

Summary: In this paper, we study the sum of iterates of the Euler function.
Classification : 11N56, 11N37
Keywords: Euler function, iterations, congruences 
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     author = {Luca, Florian},
     title = {On the distribution of perfect totients},
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     language = {en},
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Luca, Florian. On the distribution of perfect totients. Journal of integer sequences, Tome 9 (2006) no. 4. http://geodesic.mathdoc.fr/item/JIS_2006__9_4_a2/