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_23575917_4 (episode VARCHAR, first_broadcast VARCHAR)
### Question:
What is the episode number that was first broadcast on 3 September 2010?
### Answer:
SELECT episode FROM table_23575917_4 WHERE first_broadcast = "3 September 2010"