Earlier quoted context omitted.
This is actually a great example of an optimization that would be extremely difficult for an LLM to find. It requires a separate computation to find the smallest /largest numbers in the range with digits summing to 30. Hence, an LLM is unlikely to be able to generate them accurately on-the-fly.
O1 found it. https://chatgpt.com/share/67782b6b-6248-8012-882d-238b600ef9...
Sadly it failed to make a separate loop to check for this first.