BasicLevel_Python/1001 害死人不偿命的(3n+1)猜想中 (3n+1)/2 是错误的吧,这里不应该除以2 https://github.com/liuchuo/PAT/blob/master/BasicLevel_Python/1001%20%E5%AE%B3%E6%AD%BB%E4%BA%BA%E4%B8%8D%E5%81%BF%E5%91%BD%E7%9A%84(3n%2B1)%E7%8C%9C%E6%83%B3%20%EF%BC%8815%20%E5%88%86).py#L8