Linked Questions

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Solve the Diophantine equation $3x^2 - 2y^2 =1$

Solve $$3x^2 - 2y^2 =1$$ in $\mathbb{Z}$. How can we do it? ( All of answers gave me a great help. Thanks a lot kind stackexchangers.)
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Classification of the positive integers not being the sum of four non-zero squares

It is well known that every positive integer is the sum of at most four perfect squares (including $1$). But which positive integers are not the sum of four non-zero perfect squares ($1$ is still ...
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