I received a very respectful email enclosing a paper and soliciting my comments.

I wouldn’t usually treat the sender of such an email like this, but I happened to notice that all the other addressees had names beginning `pj`, so I doubt that I had been carefully selected.

A glance at the attachment showed two things.

- First, it contained two proofs that π = (14−√2)/4.
- Second, it was not a manuscript or preprint, but a reprint from an international journal with the spuriously precise impact factor of 3.785.

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## About Peter Cameron

I count all the things that need to be counted.

I believe the precise value of the journal’s impact factor is (14−√7)/3.

Thanks for that — I hoped someone would do the sum and save me the trouble!

Irrational impact factors open up a whole new area of research for bibliometricians.

The existing impact factors feel sufficiently irrational to me …

According to my calculator, (14-sqrt(2))/4 = 3.146446[…], so that impact factor is more accurate that the approximation of pi…..