Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
What is the production number for episode 23?

### Inputs:
table_name: table, columns: ['Episode #', 'Prod #', 'Title', 'Directed by', 'Written by', 'Originalairdate', 'Filmed']

### Response:
SELECT MIN Prod # FROM table WHERE Episode # = 23