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. -/