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_23287683_1 (season__number VARCHAR, production_code VARCHAR)

### Question ###
List all season numbers with production codes of 5m21.

### Accurate SQL ###

SELECT season__number FROM table_23287683_1 WHERE production_code = "5M21"