eBay auctions
On April 20, 2004, Bill Tozier, a researcher with an Erdős number of 4, offered the chance for collaboration to attain an Erdős number of 5 in an auction on eBay. The final bid was $1,031, though apparently the winning bidder had no intention to pay. The winner (who already had an Erdős number of 3) considered it a "mockery", and said "papers have to be worked and earned, not sold, auctioned or bought".
Another eBay auction offered an Erdős number of 2 for a prospective paper to be submitted for publication to Chance (a magazine of the American Statistical Association) about skill in the World Series of Poker and the World Poker Tour. It closed on 22 July 2004 with a winning bid of $127.40.
Cultural anecdotes
It is jokingly said that American baseball player Hank Aaron has an Erdős number of 1 because he autographed a baseball with Erdős when Emory University awarded them both honorary degrees on the same day.
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