involving Egyptian fractions always can be solved (Obláth 1950, Rosati 1954, Bernstein 1962, Yamamoto 1965, Vaughan 1970, Guy
1994). Swett has established validity of the conjecture for all .
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10/28/99. http://math.uindy.edu/swett/esc.htm.Vaughan,
R. C. "On a Problem of Erdős, Straus and Schinzel." Mathematika17,
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Penguin Dictionary of Curious and Interesting Numbers. Middlesex, England:
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