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_10749367_3 (_number INTEGER, air_date VARCHAR)
### Question:
What episode aired on 18 April 2007?
### Answer:
SELECT MIN(_number) FROM table_10749367_3 WHERE air_date = "18 April 2007"