@nprofile1q... Seems you already have your answers to the maths question! Younger me considered writing a vampyre story but never got beyond the planning. I wanted to deviate somewhat from canon and have it covered in barely noticeable scars (only visible if you looked carefully, as the undead heal differently). I thought, living that long isn't going to leave you unscathed, is it? Especially if you have to hunt *humans* to survive...

You're welcome to the idea if it feels right for your story.