declare @t table (ID int,CODE varchar(7))
insert into @t
select 5,'02Y1111' union all
select 6,'02Y1111' union all
select 10,'02Y1111' union all
select 16,'02Y1111' union all
select 17,'02Y1111' union all
select 18,'02Y1111'

select * from @t where ID in(
select min(ID) from (select *,rid=(select count(1) from @t where ID<=a.ID) 
from @t a) b group by ID-rid)

/*
ID          CODE
----------- -------
5           02Y1111
10          02Y1111
16          02Y1111
*/