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Comment by c22 | Hacker News Reader

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See also: Erdős number

https://en.wikipedia.org/wiki/Erd%C5%91s_number

And the related XKCD https://www.xkcd.com/599/

I wonder if there is an XKCD number: how many ref outs until you can find an XKCD comic?

See also: Erdős–Bacon number

https://en.wikipedia.org/wiki/Erdős–Bacon_number

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