Dynamic data validation

Im looking for a way to setup a data validation where the user has to enter a number within a dynamic range based on a value set by a number in a different cell
So if A1 = 314 I need to make sure the user can only enter values between 4001 and 4365
If A1 is changed to 317 the user has to enter a number between 7001 and 7365

I can easily capture the 3rd digit (4 or 7 in my example) with a RIGHT statement but I need to apply that to the max and min values allowed in the data entry cell.

Any help would be REALLY appreciated

Where did 7001 and 7365 come from to test the range?

Workbook_SheetChange event

and you want to see if 317 is between 7001 and 7365?

Thank you Glen Kennedy your solution worked perfectly! I had something similar in my original attempt but yours gives me exactly what I was looking for