Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE table_name_70 (visitor VARCHAR, record VARCHAR)
### Question:
What is the Visitor of the game with a Record of 21–17–13?
### Answer:
SELECT visitor FROM table_name_70 WHERE record = "21–17–13"