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_24938621_3 (no VARCHAR, written_by VARCHAR)

### Question ###
What episode number was written by Gregg Hurwitz?

### Accurate SQL ###

SELECT no FROM table_24938621_3 WHERE written_by = "Gregg Hurwitz"