Geodesic
On integers with a special divisibility property
Archivum mathematicum, Tome 42 (2006) no. 1, pp. 31-42.

Voir la notice de l'article provenant de la source Czech Digital Mathematics Library

In this note, we study those positive integers $n$ which are divisible by $\sum _{d|n}\lambda (d)$, where $\lambda (\cdot )$ is the Carmichael function.
Classification : 11N37
Keywords: Euler function; Carmichael function 
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Banks, William D.; Luca, Florian. On integers with a special divisibility property. Archivum mathematicum, Tome 42 (2006) no. 1, pp. 31-42. http://geodesic.mathdoc.fr/item/ARM_2006__42_1_a3/