Geodesic
On positive integers \(n\) with a certain divisibility property
Journal of integer sequences, Tome 12 (2009) no. 3
In this paper, we study the positive integers $n$ having at least two distinct prime factors such that the sum of the prime factors of $n$ divides $2^{n-1} - 1$.
Classification : 11A41, 11N25
Keywords: primes, sieve methods 
@article{JIS_2009__12_3_a2,
     author = {Luca,  Florian and Tipu,  Vicentiu},
     title = {On positive integers \(n\) with a certain divisibility property},
     journal = {Journal of integer sequences},
     year = {2009},
     volume = {12},
     number = {3},
     zbl = {1275.11014},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/JIS_2009__12_3_a2/}
}
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Luca,  Florian; Tipu,  Vicentiu. On positive integers \(n\) with a certain divisibility property. Journal of integer sequences, Tome 12 (2009) no. 3. http://geodesic.mathdoc.fr/item/JIS_2009__12_3_a2/