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_16581695_4 (no_in_series VARCHAR, production_code VARCHAR)
### Question:
What is the series episode number of the episode with production code 303?
### Answer:
SELECT no_in_series FROM table_16581695_4 WHERE production_code = "303"