107 (number)

107 is the 28th prime number. The next prime is 109, with which it comprises a twin prime, making 107 a Chen prime. Plugged into the expression 2^p - 1, 107 yields 162259276829213363391578010288127, a Mersenne prime. 107 is itself a safe prime. It is the fourth Busy beaver number, the maximum number of steps that any Turing machine with 2 symbols and 4 states can make before eventually halting. It is the number of triangle-free graphs on 7 vertices. It is the ninth emirp, because reversing its digits gives another prime number (701) ==In other fields==

107 is also: • The emergency telephone number in Argentina and Cape Town. • The telephone of the police in Hungary. In sports • The 107% rule, a Formula One Sporting Regulation in operation from 1996 to 2002 and 2011 onward. • The number 107 is also associated with the Timbers Army supporters group of the Portland Timbers soccer team, in reference to the stadium seating section where the group originally congregated. == References ==