CREATE TABLE table_24700 ("Series #" FLOAT, "Season #" FLOAT, "Title" TEXT, "Directed by" TEXT, "Written by" TEXT, "Original air date" TEXT, "Prod. code" TEXT)

how many maximum series number have 2apx05 prod. code.
SELECT MAX("Series #") FROM table_24700 WHERE "Prod. code" = '2APX05'
SELECT MAX("Series #") FROM "table_24700" WHERE "Prod. code" = '2APX05'