CREATE TABLE table_2226817_6 (no_in_series INT, no_in_season VARCHAR)

What' the series number of the episode with season number 13?
SELECT MIN(no_in_series) FROM table_2226817_6 WHERE no_in_season = 13
SELECT MIN("no_in_series") FROM "table_2226817_6" WHERE "no_in_season" = 13