These are the show notes for episode 33 of the Travels in a Mathematical World Podcast. 33 is the smallest integer that can not be expressed as a sum of different triangular numbers. More about 33 from the 33 Mysteries website.

Earlier in the year I travelled to Glasgow and visited the University of Glasgow. While there I met Professor David Fearn and he told me about the area of magnetohydrodynamics. If you are interesed in this topic you can get an overview from Wikipedia and read a piece on David’s website “Stability of the Earth’s Magnetic Field“. If you have access (for example through Athens) you can read a review article David wrote on “Hydromagnetic flow in planetary cores“.

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