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_name_6 ( production_code INTEGER, written_by VARCHAR, season__number VARCHAR )

### Question ###
What is the highest production code when the writer was brian egeston after season 5?

### Accurate SQL ###

SELECT MAX(production_code) FROM table_name_6 WHERE written_by = "brian egeston" AND season__number > 5