Hopefully we will know the answers this year.
1)Is there a ranked peak in Colorado whose rank is higher than its height(in feet)?
My guess is no. The lowest known ranked summit is 4711' Two Buttes. I suspect Colorado only has about 4000 ranked peaks.
2)What is the highest number X for which there are at least X peaks in Colorado with prominence X(feet)?
For example, Colorado has way over 300 peaks with prominence 300 feet. It does not have 1000 peaks with prominence 1000.
My guess is 750.