On 11/30/06, charles.r.matthews@ntlworld.com
You're putting an awful lot of faith in the completeness and accuracy of our own information ... which in this case changes or should change every time one of a whole bunch of people publishes a preprint with a new collaborator. (By the way, do you update ENs at the preprint or journal publication stage, which might be years on?) It's a fun trivia game, but nightmarish, and EN2 is really the maximum we should allow on the site.
Heh, I wasn't being serious. The Erdos number 1's might be interesting - there are probably hundreds of those, given that he produced something like 650 papers and rarely worked alone. But I wouldn't go beyond that as a category. Even a list of Erdos numbers would be of pretty marginal value as it would be unlikely to be complete, even for low numbers.
Steve