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erdos_830.parts.i
Specification
**Erdos Problem 830, Part 1** We say that $a,b\in \mathbb{N}$ are an amicable pair if $\sigma(a)=\sigma(b)=a+b$. Are there infinitely many amicable pairs?
Lean 4 Statement
theorem erdos_830.parts.i : answer(sorry) ↔ {(a, b) | IsAmicable a b}.Infinite
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