$x^2 + 3xy + y^2 = n$ Diophantine Equation

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I was wondering if someone could direct me towards information regarding the $x^2 + 3xy +y^2 = n$ diophantine equation. Additionally, is there anything about the general case of these diophantine equations in the form $x^{2k} + 3x^ky^k + y^{2k} = n$?

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I recommend Conways's topograph method. Here is the diagram for $u^2 + uv - v^2,$ which is "equivalent" to your form, which is reduced in Zagier's style.

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