What episode had 1.42 million viewers?
CREATE TABLE "table1_23399481_3" (
  "series_num" real,
  "season_num" real,
  "title" text,
  "directed_by" text,
  "written_by" text,
  "original_air_date" text,
  "u_s_viewers_in_millions" text
);
SELECT "series_num" FROM "table1_23399481_3" WHERE "u_s_viewers_in_millions"='1.42';