18

This number is a composite.

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

18 is the only two-digit number m , such that three numbers, m + prime(m), m^2 + prime(m^2) & m^3 + prime(m^3), are primes. [Firoozbakht]

Submitted: 2004-07-22 06:01:41; Last Modified: 2008-01-30 17:28:00.