Positive integers $n$ such that $n\mid a^{\sigma \left(n\right)}-1$.

Luca, Florian. "Positive integers such that .." Novi Sad Journal of Mathematics 33.2 (2003): 49-66. <http://eudml.org/doc/125862>.

@article{Luca2003,
author = {Luca, Florian},
journal = {Novi Sad Journal of Mathematics},
keywords = {sum of divisors; pseudoprimes; Carmichael numbers; Euler's totient},
language = {eng},
number = {2},
pages = {49-66},
publisher = {University of Novi Sad, Faculty of Science, Institute of Mathematics},
title = {Positive integers such that .},
url = {http://eudml.org/doc/125862},
volume = {33},
year = {2003},
}

TY - JOUR
AU - Luca, Florian
TI - Positive integers such that .
JO - Novi Sad Journal of Mathematics
PY - 2003
PB - University of Novi Sad, Faculty of Science, Institute of Mathematics
VL - 33
IS - 2
SP - 49
EP - 66
LA - eng
KW - sum of divisors; pseudoprimes; Carmichael numbers; Euler's totient
UR - http://eudml.org/doc/125862
ER -