How to select non-consecutive rows in MySQL?

Question

If the primary keys of the records are 1,3,4,5,6,8

I want to select the records with pk:1,6

NOTE

I don\'t

Answer 1

SELECT *
FROM your_table AS a
    LEFT JOIN your_table AS b
        ON a.key_column = b.key_column - 1
WHERE b.key_column IS NULL