Well yeah, do the maths LOL.
I am seeing loads of places that skip 13.
Also even if there is no phone line or broadband for a said address it will still show up, but it may have a mixing district id or Nad Key.
But where address 13 is not even listed, I am gathering that 13 doesn't exists down that road.
Might check on Google Maps to make sure

Google Maps can't seem to find it.
Paul
Edited by PaulKirby (Thu 07-May-15 21:03:42)