@article{Knuth07a,
  title = {Problem 11274},
  author = {Donald E. Knuth},
  year = {2007},
  url = {http://www.jstor.org/stable/27642151},
  researchr = {https://researchr.org/publication/Knuth07a},
  cites = {0},
  citedby = {0},
  journal = {The American Mathematical Monthly},
  volume = {114},
  number = {2},
  pages = {165},
}