CREATE TABLE table_12995531_3 (series_number VARCHAR, date_of_first_broadcast VARCHAR)

what is the series number where the date of first broadcast is 16 october 2008?
SELECT series_number FROM table_12995531_3 WHERE date_of_first_broadcast = "16 October 2008"
SELECT "series_number" FROM "table_12995531_3" WHERE "16 October 2008" = "date_of_first_broadcast"