Fill in the missing number in this unique sequence puzzle

My friend Ed woke up this morning to find his website defaced. Upon the now altered web page, he found this number sequence:

$$237,\ 3566,\ 57069,\ \color{green}{???},\ 14600926,\ 233811181$$

One of the numbers is missing, can you figure out what it could be?

Note: the story is fictional and can be used as a hint. Additional hints may be added if the puzzle remains unsolved.

• 404 ? Not found... – Pierre Schneegans Aug 13 '20 at 15:01