Normally I try and come up with an apt pun but I couldn’t possibly come up with anything better than the title of my guest Sarah Hart’s book. She has written Once Upon A Prime, a very enjoyable read and listen about the many links between maths and literature and myth and poetry.

We talk about why giants as we know them can’t exist, the 19th century obsession with statistics, the maths of Ulysses and Moby Dick and taking an idea for a walk.