The number of solutions of .
Ford, Kevin (1999)
Annals of Mathematics. Second Series
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Ford, Kevin (1999)
Annals of Mathematics. Second Series
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John Friedlander, Andrew Granville (1992)
Compositio Mathematica
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De Koninck, Jean-Marie, Luca, Florian (2005)
Integers
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M. Murty, V. Murty (1979)
Acta Arithmetica
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R. Tijdeman (1973)
Compositio Mathematica
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K. Győry, A. Sárközy, C. L. Stewart (1996)
Acta Arithmetica
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M. Dodson (1969)
Acta Arithmetica
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P. Erdös, T. Shorey (1976)
Acta Arithmetica
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Garunkštis, R. (2002)
Experimental Mathematics
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