A

mathematical term referring to a

set of

non-negative integers such that no two

distinct pairs of

numbers from the

set have the same

difference. In

real world terms, its a

ruler with no pair of marks measuring the same distance. Useful in fields such as

X-ray crystallography and

radio astronomy.

The current best known Golomb ruler is:

** 0-2-22-32-21-5-1-12-34-15-35-7-9-60-10-20-8-3-14-19-4. **

Testing for new rulers becomes exponentially difficult, and has become the task of distributed.net's OGR competition.