CREATE TABLE table_29803475_2 (no_in_series NUMBER, us_viewers__million_ VARCHAR2)

What is the lowest number in series when U.S. viewers is 0.23 million?
SELECT MIN(no_in_series) FROM table_29803475_2 WHERE us_viewers__million_ = "0.23"
SELECT MIN("no_in_series") FROM "table_29803475_2" WHERE "0.23" = "us_viewers__million_"