These are the show notes for episode 25 of the Travels in a Mathematical World podcast. 25 is the smallest square that can be written as a sum of 2 squares. More about 25 from Number Gossip.

In the regular Maths History series, Noel-Ann Bradshaw of the University of Greenwich and also Meetings Co-ordinator of the British Society for the History of Mathematics talks about the life and works of Fibonacci. Read a biography of Fibonacci at the MacTutor History of Mathematics Archive. I’ll also pick out a couple of articles in Plus magazine: “The life and numbers of Fibonacci” and “The Mathematics of Fibonacci’s Sequence”. There are a lot of other Fibonacci references out there and I will pick out an extensive site “Fibonacci Numbers and the Golden Section” by Dr Ron Knott. You can listen to an episode of BBC Radio 4’s In Our Time on the Fibonacci sequence.

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