Book:Richard K. Guy/Unsolved Problems in Number Theory/Third Edition/Errata

Numbers $n$ whose Euler Phi value Divides $n + 1$
$\mathbf B$: Divisibility: $\mathbf {B 37}$: Does $\map \phi n$ properly divide $n - 1$?

Triples with Same Sum and Same Product
$\mathbf D$: Diophantine Equations: $\mathbf {D 16}$: Triples with Same Sum and Same Product