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_22347090_6 (no_in_series INTEGER, production_code VARCHAR)

### Question ###
What episode number in the series had a production code of 3x7554?

### Accurate SQL ###

SELECT MIN(no_in_series) FROM table_22347090_6 WHERE production_code = "3X7554"