On p127, I say Mersenne overlooked $M_{69}$, $M_{89}$ and $M_{127}$; he actually overlooked $M_{61}$, $M_{89}$ and $M_{107}$. Thanks to Maisie Shepherd for spotting my error!

On p165, the infinite sum should read $\frac{1}{0!} + \frac{1}{1!} + \frac{1}{2!} + \frac{1}{3!} + \dots = 1 + 1 + \frac{1}{2} + \frac{1}{6} +\dots$. Thanks to Peter Skelton who alerted me to this.

On p274, I refer to “Isaac” Halperin. Professor Halperin’s forename was, in fact, Israel. Thanks to Alain Duncan for pointing this out.