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_20205538_4 ( episode__number VARCHAR, series__number VARCHAR )

### Question ###
What is the episode number for series 17?

### Accurate SQL ###

SELECT episode__number FROM table_20205538_4 WHERE series__number = 17