CREATE TABLE table_29102612_1 (season__number INT, us_viewers__millions_ VARCHAR)

What is the season # when ther are 5.3 million U.S viewers?
SELECT MAX(season__number) FROM table_29102612_1 WHERE us_viewers__millions_ = "5.3"
SELECT MAX("season__number") FROM "table_29102612_1" WHERE "5.3" = "us_viewers__millions_"