In 2007, while taking a break from a few logic problems, I searched Google for numeric ranges such as these:

123...233
1232...2313
93...786

I discovered that Google treated the three dots as a range and returned numbers between the two values.

When I accidentally tried only two dots with much larger ranges, such as the examples below, the server took a long time to respond and eventually returned a 404 page:

1000000..100000000
1000000..10000031231
10000321..10000031231

At the time, it looked like an unvalidated input case in the search engine. Its current behavior may be completely different.