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_22580855_1 (written_by VARCHAR, series_no VARCHAR)
### Question:
who are the writer of the series episode number 170?
### Answer:
SELECT written_by FROM table_22580855_1 WHERE series_no = 170