@article{Knuth05-0,
  title = {Problem 11142},
  author = {Donald E. Knuth},
  year = {2005},
  url = {http://www.jstor.org/stable/30037451},
  researchr = {https://researchr.org/publication/Knuth05-0},
  cites = {0},
  citedby = {0},
  journal = {The American Mathematical Monthly},
  volume = {112},
  number = {3},
  pages = {273-274},
}