Problem 10906. Knuth, D. E. The American Mathematical Monthly, 108(9):872, 2001.
Problem 10906. [link]Link  Problem 10906. [link]Paper  bibtex   
@article{journals/tamm/Knuth01c,
  added-at = {2013-05-17T00:00:00.000+0200},
  author = {Knuth, Donald E.},
  biburl = {https://www.bibsonomy.org/bibtex/2807273462643b8cf3538045189747549/dblp},
  ee = {http://www.jstor.org/stable/2695567},
  interhash = {07b4ba65a0794ebb79cdd001b121117c},
  intrahash = {807273462643b8cf3538045189747549},
  journal = {The American Mathematical Monthly},
  keywords = {dblp},
  number = 9,
  pages = 872,
  timestamp = {2013-08-13T13:03:52.000+0200},
  title = {Problem 10906.},
  url = {http://dblp.uni-trier.de/db/journals/tamm/tamm108.html#Knuth01c},
  volume = 108,
  year = 2001
}

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