create or replace function do_while(init) as table (
  with recursive cte as (
    select init+1 as value     -- Increment unconditionally
    union all                  -- Loop
    select value+1 as value    -- Each time through the loop, add 1 to the value then print it.
    from cte
    where value % 6 != 0       -- "while value mod 6 is not equal to 0"
  )
  from cte order by value
);

# The task
from do_while(0);

# Also check that the loop executes at least once.
from do_while(-1);