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isWeakGiuga_iff_prime_dvd
Specification
A composite number $n$ is weak Giuga if and only if $p \mid (\frac{n}{p} - 1)$ for all prime divisors $p$ of $n$.
Lean 4 Statement
theorem isWeakGiuga_iff_prime_dvd {n : ℕ} (hn : n.Composite) :
IsWeakGiuga n ↔ ∀ p ∈ n.primeFactors, p ∣ (n / p - 1)
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