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An Integer which is expressible in only one way in the form $x^2+Dy^2$ or $x^2-Dy^2$ where $x^2$ is Relatively Prime to $Dy^2$. If the Integer is expressible in more than one way, it is called a Polymorph.

See also Antimorph, Idoneal Number, Polymorph

© 1996-9 Eric W. Weisstein