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

A little improvement for the solution proposed by Robin Day

SELECT
    [MyId] + 1
FROM
    [MyTable]
WHERE
    [MyId] NOT IN
(
    SELECT
        [MyId] - 1
    FROM
        [MyTable]
)
ORDER BY [MyId] + 1