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_1620397_5 (series_sorted VARCHAR, _number VARCHAR)

### Question ###
What series was sorted at number 3?

### Accurate SQL ###

SELECT series_sorted FROM table_1620397_5 WHERE _number = 3