Problem 10871. Knuth, D. E. The American Mathematical Monthly, 108(4):372, 2001.
Problem 10871. [link]Link  Problem 10871. [link]Paper  bibtex   
@article{journals/tamm/Knuth01a,
  added-at = {2013-05-17T00:00:00.000+0200},
  author = {Knuth, Donald E.},
  biburl = {https://www.bibsonomy.org/bibtex/2e807b21eb5fc0a25e189baf72b48a7e6/dblp},
  ee = {http://www.jstor.org/stable/2695253},
  interhash = {43d122ad57e1b7bd9de27a4c4039cdbe},
  intrahash = {e807b21eb5fc0a25e189baf72b48a7e6},
  journal = {The American Mathematical Monthly},
  keywords = {dblp},
  number = 4,
  pages = 372,
  timestamp = {2013-08-13T13:05:22.000+0200},
  title = {Problem 10871.},
  url = {http://dblp.uni-trier.de/db/journals/tamm/tamm108.html#Knuth01a},
  volume = 108,
  year = 2001
}

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