255

This number is a composite.

Single Curio View: (Seek other curios for this number)

The smallest number n that is neither a prime nor a semiprime such that there is only one group of order n. It happens when n and phi(n) are relatively prime. [Gudipati]

Submitted: 2026-06-02 08:23:39; Last Modified: 2026-06-02 10:49:36.