I suspect that any school that offers a PhD in CS and a PhD in math would be able to provide sufficient academic offerings for OP. For schools that aren’t too far from the middle of Pennsylvania:
- Kent State (OH)
- Michigan State
- George Mason (VA)
- West Virginia University
- SUNY Albany
- and…mentioned above…U. at Buffalo
Most of those schools have very generous acceptance rates. They’re just not the most popular colleges in the country.