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_1971734_1 ( prod__number VARCHAR, filmed VARCHAR )

### Question ###
What was the production number of the episode filmed in aug/sept 1968?

### Accurate SQL ###

SELECT prod__number FROM table_1971734_1 WHERE filmed = "Aug/Sept 1968"