@article{Knuth01a,
  title = {Problem 10871},
  author = {Donald E. Knuth},
  year = {2001},
  url = {http://www.jstor.org/stable/2695253},
  researchr = {https://researchr.org/publication/Knuth01a},
  cites = {0},
  citedby = {0},
  journal = {The American Mathematical Monthly},
  volume = {108},
  number = {4},
  pages = {372},
}