Anyone who wants to add a number may do so in front of his or her house or place of business. Of course, you can also sponsor more than one number! Many companies have joined the effort.
Two examples:

The first number („7“) was placed with the support of a local bank (Kreissparkasse Northeim). In all the Sparkasse has now sponsored a total of ten numbers – all of them 7´s. The tenth 7 (the 139th decimal place) is embedded with the bank´s logo in front of the branch in Nörten-Hardenberg.

In May of 2007, Hardenberg-Wilthen AG joined the effort. It has now donated a total of 5 plaques, with the numbers 84811 (decimal places 150 to 154), each of which also have the company´s boarhead logo on them.