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Things of interest in Maths & Science

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Pick a number between 1 and 99, write it as a word, then count the letters to get a new number. Write the new number as a word, and count its letters- repeat.  This curiosity was tweeted by @IanMathmogician, and if you try it you’ll find you get stuck at the number 4- the only number equal to its letter-count.  This image shows the network of what  your possible routes to 4 could be. It shows you’ll always get there after 5 steps. [code] [French version] [full size image]

Pick a number between 1 and 99, write it as a word, then count the letters to get a new number. Write the new number as a word, and count its letters- repeat.  This curiosity was tweeted by @IanMathmogician, and if you try it you’ll find you get stuck at the number 4- the only number equal to its letter-count.  This image shows the network of what  your possible routes to 4 could be. It shows you’ll always get there after 5 steps. [code] [French version] [full size image]

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    1. Välj ett heltal mellan 0 och 100 (1-99) 2. Skriv talet på engelska 3. Räkna bokstäverna 4. Repetera punkt 2 och 3...
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Matt Henderson

I post original stuff about maths, space, computational linguistics and other things that I like. This blog is meant to be accessible and interesting to people of all backgrounds. My undergrad was maths in Cambridge, and I'm now starting research in Speech and Language technology. Email me at If you're new, check out this overview of my posts. All code posted is in Mathematica.

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