The curves with integer , , and were studied by de Sluze between 1657 and 1698. The name "Pearls of Sluze" was given to these curves by Blaise Pascal (MacTutor Archive).
Pearls of Sluze
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References
MacTutor History of Mathematics Archive. "Pearls of Sluze." http://www-groups.dcs.st-and.ac.uk/~history/Curves/Pearls.html.Smith, D. E. History of Mathematics, Vol. 2: Special Topics of Elementary Mathematics. New York: Dover, p. 330, 1958.Referenced on Wolfram|Alpha
Pearls of SluzeCite this as:
Weisstein, Eric W. "Pearls of Sluze." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/PearlsofSluze.html