The book has been updated from last year with a whole new chapter, new cover, and fewer typos, according to Hannah.
The copies signed by Hannah and her co-author Dr Thomas Oléron Evans have been sent to top Numberphile Patreon supporters (you will have been messaged if one is coming!)
However if you'd like to buy the book, it's available all over the place... Or you can use the Amazon affiliate links below.
It's not just a fun book - it's great to support the work of people like Hannah who have always been generous with their time for Numberphile.
Looking for stocking fillers? Other Numberphile collaborators with great books include...