Primes

The reminders about Amazon Prime day got me thinking about Prime Numbers. Whilst I was coding a power efficient “blink” for a new 4Tronix board I joked that it was not calculating primes. But then I thought, “why not?” I
Metal solids of constant width

I’ve mentioned before when I was looking at measuring tools, John Bryant and Chris Sangwin and the book “how round is your circle”. One of the interesting items from the book was a selection of metal objects that had constant