user: Question: What was the production number of the episode filmed in Aug/Sept 1968?
Columns: ['Episode #', 'Prod #', 'Title', 'Directed by', 'Written by', 'Originalairdate', 'Filmed']
Types: ['real', 'real', 'text', 'text', 'text', 'text', 'text']
Sample row: [1.0, 104.0, '"REPORT 5055: CULT Murder Shrieks Out"', 'Charles Crichton', 'Morris Farhi', '21 September 1969', 'Sept. 1968']
SQL:

assistant: SELECT "Prod #" FROM "Table" WHERE "Filmed" = 'Aug/Sept 1968';