Geodesic
On the sum of iterations of the Euler function
Journal of integer sequences, Tome 9 (2006) no. 1
We study the sum
Classification : 11N37, 11N60
Keywords: Euler function, iterations, congruences 
@article{JIS_2006__9_1_a7,
     author = {Shparlinski,  Igor E.},
     title = {On the sum of iterations of the {Euler} function},
     journal = {Journal of integer sequences},
     year = {2006},
     volume = {9},
     number = {1},
     zbl = {1107.11040},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/JIS_2006__9_1_a7/}
}
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Shparlinski,  Igor E. On the sum of iterations of the Euler function. Journal of integer sequences, Tome 9 (2006) no. 1. http://geodesic.mathdoc.fr/item/JIS_2006__9_1_a7/