This puzzle is based off the What is a Word™, What is a Phrase™ and What is a Number™ series started by JLee.
If a number conforms to a certain rule, I call it a CB Number™. Use the following examples to find the rule:
Here is a CSV:
CB Numbers™,Non-CB Numbers™ 383,384 1412,1214 7557,8557 49537,43579 84286,86420 310222,420333 629218,639318 1234511,5432111 4762129,4763239 22222530,33333520 63655555,36355555 89899898,89898989
The puzzle relies on the series' inbuilt assumption, that each number can be tested for whether it is a CB Number™ own its own. In particular, a number's relationship to other numbers in the sequence is irrelevant.
These are not the only examples of CB Numbers™, more can be found.
The only reason the Non-CB Numbers™ are not in ascending order is because I have tried to make them look similar to the corresponding CB Numbers™ to their left. Note that this doesn't change the puzzle.