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Towards a working definition of the terrifying numbers

Someone — it may have been Matt Parker — told the MathsJam conference last weekend there was now a terrifying number of monthly MathsJam meetups, and a murmur went around the room. It was just about the only audience in the world where more than a couple of people would have asked “how do you define a terrifying number?”

Interesting Esoterica Summation, volume 4

Dust off your thinking hat and do some mind-stretches because here’s another course of Interesting Maths Esoterica! It’s been several months since the last volume so this is quite a big post. I won’t mind if you skim it.

In case you’re new to this: every now and then I encounter a paper or a book or an article that grabs my interest but isn’t directly useful for anything. It might be about some niche sub-sub-subtopic I’ve never heard of, or it might talk about something old from a new angle, or it might just have a funny title. I put these things in my Interesting Esoterica collection on Mendeley. And then when I’ve gathered up enough, I collect them here.