Problem 10858. Knuth, D. E. The American Mathematical Monthly, 108(3):271, 2001.
Problem 10858. [link]Link  Problem 10858. [link]Paper  bibtex   
@article{journals/tamm/Knuth01,
  added-at = {2013-05-17T00:00:00.000+0200},
  author = {Knuth, Donald E.},
  biburl = {https://www.bibsonomy.org/bibtex/26e70d9ce8b1c308f0eb548628ed34123/dblp},
  ee = {http://www.jstor.org/stable/2695392},
  interhash = {0e377af2a489f80c3653688c9ff04cd9},
  intrahash = {6e70d9ce8b1c308f0eb548628ed34123},
  journal = {The American Mathematical Monthly},
  keywords = {dblp},
  number = 3,
  pages = 271,
  timestamp = {2013-08-13T13:05:19.000+0200},
  title = {Problem 10858.},
  url = {http://dblp.uni-trier.de/db/journals/tamm/tamm108.html#Knuth01},
  volume = 108,
  year = 2001
}

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