Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_2144389_9 ( episodes_used VARCHAR, _number VARCHAR )

### Question ###
When 1 is the number what episodes were used?

### Accurate SQL ###

SELECT episodes_used FROM table_2144389_9 WHERE _number = 1