{"id":"ugly-number-one-is-ugly","text":"`is_ugly(1)` returns `True` because 1 has no prime factors, so the loop body never executes and `n == 1` holds","truth_value":"IN","source":"entries/2026/06/06/ugly-number-solution.md","source_url":"","source_hash":"","justifications":[],"dependents":[],"metadata":{},"created_at":"","updated_at":"","reviewed_at":"","verified_at":"","retracted_at":"","explanation":{"steps":[{"node":"ugly-number-one-is-ugly","truth_value":"IN","reason":"premise"}]}}