#math trivia for #September11: #254 is the product of a prime and a Mersenne prime. What are the primes?

— Burt Kaliski Jr. (@modulomathy) September 11, 2013

A Mersenne prime is a prime *p* that has the form *p* = 2^{q}-1 where *q* is also prime*.*

The prime factors of 254 are 2 and 127. The second factor is the Mersenne prime. (For the reader: What is the value of *q* for this prime?)