CREATE TABLE table_29497 ("No." FLOAT, "Title" TEXT, "Directed by" TEXT, "Written by" TEXT, "Original air date" TEXT, "Production code" TEXT, "U.S. viewers  ( million ) " TEXT)

which number lists the production code as 2j5809
SELECT "No." FROM table_29497 WHERE "Production code" = '2J5809'
SELECT "No." FROM "table_29497" WHERE "Production code" = '2J5809'