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REFERENCES
| M. Gardner, The Unexpected Hanging and Other Mathematical Diversions. Simon and Schuster, NY, 1969, p. 189.
T. R. Parkin, personal communication.
Popular Computing, Vol. 1 (No. 7, 1973), front cover and page 2.
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
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