Geodesic
On the Euler function of Fibonacci numbers
Journal of integer sequences, Tome 12 (2009) no. 6
In this paper, we show that for any positive integer $ k$, the set
Keywords: Fibonacci numbers, Euler function, sieve methods 
@article{JIS_2009__12_6_a4,
     author = {Luca,  Florian and Mej{\'\i}a Huguet,  V. Janitzio and Nicolae,  Florin},
     title = {On the {Euler} function of {Fibonacci} numbers},
     journal = {Journal of integer sequences},
     year = {2009},
     volume = {12},
     number = {6},
     zbl = {1201.11006},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/JIS_2009__12_6_a4/}
}
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Luca,  Florian; Mejía Huguet,  V. Janitzio; Nicolae,  Florin. On the Euler function of Fibonacci numbers. Journal of integer sequences, Tome 12 (2009) no. 6. http://geodesic.mathdoc.fr/item/JIS_2009__12_6_a4/