Search for gaps or missing entries

Hello, how can I find the gaps, respectively entries missing in a number column.
CREATE TABLE TEST)
NUMMER NUMBER
);
INSERT INTO TEST (NUMMER) VALUES (2);
INSERT INTO TEST (NUMMER) VALUES (6);
INSERT INTO TEST (NUMMER) VALUES (8);
INSERT INTO TEST (NUMMER) VALUES (12);
INSERT INTO TEST (NUMMER) VALUES (14);

I need to determine 1,3,4,5,7,9,10,11,13
 select  level nummer
    from  dual
    connect by level <= (select max(nummer) from test)
minus
 select  nummer
   from  test
order by nummer
/

    NUMMER
----------
         1
         3
         4
         5
         7
         9
        10
        11
        13

9 rows selected.

SQL> 

SY.

Tags: Database

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