@article{Luca04-1,
  title = {Problem 11090},
  author = {Florian Luca},
  year = {2004},
  url = {http://www.jstor.org/stable/4145077},
  researchr = {https://researchr.org/publication/Luca04-1},
  cites = {0},
  citedby = {0},
  journal = {The American Mathematical Monthly},
  volume = {111},
  number = {6},
  pages = {534},
}