Geodesic
On the distribution of perfect totients
Journal of integer sequences, Tome 9 (2006) no. 4
In this paper, we study the sum of iterates of the Euler function.
Classification : 11N56, 11N37
Keywords: Euler function, iterations, congruences 
@article{JIS_2006__9_4_a2,
     author = {Luca,  Florian},
     title = {On the distribution of perfect totients},
     journal = {Journal of integer sequences},
     year = {2006},
     volume = {9},
     number = {4},
     zbl = {1107.11039},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/JIS_2006__9_4_a2/}
}
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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/