Wall numbers in German church / during German burial ceremony

I have just came about a 10 years old photo of my aunt's burial ceremony that took place in June 2009 in one of the German churches (in a small city close to Oldenburg). Unfortunately, relation both with my aunt and her living family was/is very weak, so I can't even say, if she was Christian or Protestant and thus, in which church following photo was taken? Does anyone know what are these numbers printed on the wall in the right part of the photograph? My first and only guess was that these are song numbers that will be sing during the ceremony. But then, what are those additional numbers (or actually some kind of value ranges)? And why to print song numbers permanently on the wall, if they keep to changed (depending on ceremony, day of year etc.) and thus should rather be displayed using some non-permanent way. Like a display etc.