Who was the successor for vacant louisiana 5th
CREATE TABLE "table1_2417340_4" (
  "district" text,
  "vacator" text,
  "reason_for_change" text,
  "successor" text,
  "date_successor_seated" text
);
SELECT "successor" FROM "table1_2417340_4" WHERE "vacator"='Vacant' AND "district"='Louisiana 5th';