Fortunately Brian had saved all the MP3s. I’ve posted them on S3 and huffduffed them all. I can be fairly confident that Huffduffer won’t be going the way of Pownce, Magnolia, Geocities, and so many more.
Anyway, if you want to listen to the fifteen episodes of the three radio series’ on mathematics, you can subscribe to the podcast at https://huffduffer.com/adactio/tags/five+numbers/rss.
Or you can listen to each episode at these permanent URLs:
Another Five Numbers
A Further Five Numbers