How many people watched episode number 13?
CREATE TABLE table_29631 (
    "#" real,
    "No." real,
    "Title" text,
    "Directed by" text,
    "Written by" text,
    "Viewers" real,
    "Original airdate" text,
    "Prod. code" real
)
SELECT "Viewers" FROM table_29631 WHERE "#" = '13'
Below are sql tables schemas paired with instruction that describes a task. Using valid SQLite, write a response that appropriately completes the request for the provided tables. ### Instruction: How many people watched episode number 13? ### Input: CREATE TABLE table_29631 (
    "#" real,
    "No." real,
    "Title" text,
    "Directed by" text,
    "Written by" text,
    "Viewers" real,
    "Original airdate" text,
    "Prod. code" real
) ### Response: SELECT "Viewers" FROM table_29631 WHERE "#" = '13'