Odd Integers whose Smaller Odd Coprimes are Prime/Mistake

Source Work

1997: David Wells: Curious and Interesting Numbers (2nd ed.):

The Dictionary

$105$

Mistake

$105$ is the largest integer such that every odd integer less than it and prime to it is a prime number.

While all integers are coprime to $1$ (and $105$ in particular), remember that $1$ is not classified as a prime number.

The canonical exposition of this result is for $1$ to be specifically mentioned.

Sources

• 1997: David Wells: Curious and Interesting Numbers (2nd ed.) ... (previous) ... (next): $105$