Lean 4 proof of Erdős Problem 824 (Erdos 824, JSP-000680): coprime pairs a < b < x with equal sum of divisors sigma(a) = sigma(b) number more than x^(2-ε); formalization with Mathlib
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Lean 4 proof of Erdős Problem 824 (Erdos 824, JSP-000680): coprime pairs a < b < x with equal sum of divisors sigma(a) = sigma(b) number more than x^(2-ε); formalization with Mathlib
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