Florian Luca, Francis B. Coghlan. Can Two Consecutive Numbers Both Be Perfect?: 10711. The American Mathematical Monthly, 108(1):80-81, 2001. [doi]
@article{LucaC01,
title = {Can Two Consecutive Numbers Both Be Perfect?: 10711},
author = {Florian Luca and Francis B. Coghlan},
year = {2001},
url = {http://www.jstor.org/stable/2695692},
researchr = {https://researchr.org/publication/LucaC01},
cites = {0},
citedby = {0},
journal = {The American Mathematical Monthly},
volume = {108},
number = {1},
pages = {80-81},
}