Joe the concept of numbers in your society is very important to individuals on a whole. You see these figures that you call numbers are used in your everyday life from scheduling your activities to understanding the concept of time on your plane.
So we tune into this concept as it is a theme that is easily used to make contact with your side.......
Birth dates, special occasion dates, and even the date when a loved one has passed, are all used to connect the deceased with the living. These particular numbers would only be associated with a particular person and therefore the living loved one would recognize it over other random numbers.