can't understand why code do not working

[Cliff via Digitalmars-d-learn]

On Monday, 22 September 2014 at 21:28:25 UTC, Cliff wrote:
> On Monday, 22 September 2014 at 21:24:58 UTC, monarch_dodra 
> wrote:
>> On Monday, 22 September 2014 at 21:19:37 UTC, Steven 
>> Schveighoffer wrote:
>>> On 9/22/14 4:37 PM, Cliff wrote:
>>>
>>>>
>>>> Is stdout threadsafe?
>>>
>>> Yes, stdout is thread safe, it's based on C's stdout which is 
>>> thread safe.
>>>
>>> -Steve
>>
>> Techinallly, though thread "safe", concurrent writes will 
>> create garbled text. D goes one step further in the sense that 
>> it prevents concurrent writes entirely.
>
> The reason I ask is that the first iteration of his loop does 
> not show up in stdout as presented.  I would expect 1 and 3 to 
> be the first two lines of the output.

For that matter I also don't expect the 6 and 18 - nevermind, 
there must be something else going on with that loop.  He must 
have changed the loop limits.