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theorem proved term proof

gap_45_has_factor_9

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formal statement (Lean)

 329theorem gap_45_has_factor_9 : 9 ∣ gap_45 := ⟨5, rfl⟩

proof body

Term-mode proof.

 330
 331/-- The sync period 360 = 8 × 45 / gcd(8,45) = 360. -/

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