1918
This number is a composite.
1918 is the only known number m such that both 111^111 - m
and 111^111 + m are primes. [Firoozbakht]
Printed from the PrimePages <t5k.org> © G. L. Honaker and Chris K. Caldwell
This number is a composite.
1918 is the only known number m such that both 111^111 - m
and 111^111 + m are primes. [Firoozbakht]