What episode aired on 18 April 2007?
CREATE TABLE table_10749367_3 (
    _number INTEGER,
    air_date VARCHAR
)
SELECT MIN(_number) FROM table_10749367_3 WHERE air_date = "18 April 2007"
Below are sql tables schemas paired with instruction that describes a task. Using valid SQLite, write a response that appropriately completes the request for the provided tables. ### Instruction: What episode aired on 18 April 2007? ### Input: CREATE TABLE table_10749367_3 (
    _number INTEGER,
    air_date VARCHAR
) ### Response: SELECT MIN(_number) FROM table_10749367_3 WHERE air_date = "18 April 2007"