text: Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
  ### Context:
  CREATE TABLE table_25721_3 (episode_no INTEGER, airdate VARCHAR)
  ### Question:
  Which episode number aired on 18 october 2012?
  ### Answer:
  SELECT MIN(episode_no) FROM table_25721_3 WHERE airdate = "18 October 2012"