End Google Ads 201810 - BS.net 01 --> Hi.

How can I create something like this with String Formats :

1
2
3

.
.
.

10
11
12

.
.
.

99
100
101
102

.
.
.

1000
1001
1002

Actually , I wanna insert three spaces characters before a digit , like above.
Could you guide me ?

Thanks