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_29154676_1 (season_no INTEGER, us_viewers__millions_ VARCHAR)
### Question:
What is the last episode in the season that had 3.91 million viewers in the US?
### Answer:
SELECT MIN(season_no) FROM table_29154676_1 WHERE us_viewers__millions_ = "3.91"