Name the least series number with production code of 717 and season number less than 17
CREATE TABLE "season_7_2011" (
  "series_num" real,
  "season_num" real,
  "title" text,
  "directed_by" text,
  "original_air_date" text,
  "production_code" real
);
SELECT MIN("series_num") FROM "season_7_2011" WHERE "production_code"=717 AND "season_num"<17;