$\sum_{k=1}^n k = \frac{n(n+1)}{2}$

Consider the following equation.

$x^2$ = $y^2 + z^2$.

Consider the first few numbers $x_0$, $x_1$ ,,, $x_n$.

Consider the following equation.

$x^2$ = $y^2 + z^2$.

Consider the first few numbers $x_0$, $x_1$ ,,, $x_n$.

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