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_13426649_1 (original_air_date VARCHAR, _number VARCHAR)
### Question:
How many different original air dates did the episode number 6 have? 
### Answer:
SELECT COUNT(original_air_date) FROM table_13426649_1 WHERE _number = 6