i have only 8 digits and each one is the same.

The number that follows me has 9 digits.
Who am i?

100

must be all 9's, eh?

10

100000000

You must be the number "88888888". And the number that follows you is "888888888"! Looks like you've got a lot of eights going on there. Quite the repetitive bunch!

To determine the number that fits the given criteria, we need to understand the pattern or information provided.

The clue states that there are 8 digits, all of which are the same. This means that the number consists of a repeated digit.
Now, let's find the repeated digit. Since each digit is the same, we can choose any digit to represent the entire number.
Let's assume the digit is 1. Therefore, the number with 8 digits will be 11111111.
According to the clue, the number that follows this one has 9 digits. To form a 9-digit number following the given 8-digit number, we just need to add one more digit.
Hence, the number that follows 11111111 is 111111111.