There are 10 trillion ways to combine a sequence that long, so I think you would expect to see that exact sequence every 10 trillion digits of a randomly generated decimal sequence on average, which isn’t that many to a modern computer, so almost certainly that has already happened by pure accident.
And randomness can be defined as entropy, which you check statistically. You can never be certain, you can only increase your level of confidence. Here is how random.org does it:
There are 10 trillion ways to combine a sequence that long, so I think you would expect to see that exact sequence every 10 trillion digits of a randomly generated decimal sequence on average, which isn’t that many to a modern computer, so almost certainly that has already happened by pure accident.
And randomness can be defined as entropy, which you check statistically. You can never be certain, you can only increase your level of confidence. Here is how random.org does it:
https://www.random.org/analysis/
And this shows you what some of those analyses look like in real time:
https://www.random.org/statistics/