Prove $x=y$ while $x$ and $y$ are positive integers and $1+x+y$ is a prime divisor of $-1 + 4(x*y)$.
This is a homework, but I don't want a full solution - just some tips to get started.
2026-03-29 22:12:26.1774822346
Prime division proof
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Let $p=1+x+y$, and rewrite $-1+4xy$ in terms of $x$ and $p$.