CREATE TABLE table_28123 ("No. in series" FLOAT, "No. in season" FLOAT, "Title" TEXT, "Directed by" TEXT, "Written by" TEXT, "Original air date" TEXT, "Production code" FLOAT)

Name the number in series for production code being 204
SELECT "No. in series" FROM table_28123 WHERE "Production code" = '204'
SELECT "No. in series" FROM "table_28123" WHERE "Production code" = '204'