80103945599

This number is a prime.

                                                                8 0103945599

Let n = the number of paths on the surface of the 8-dimensional lattice [0..2]^8; i.e., the lattice paths that do not pass through the point (1,1,1,1,1,1,1,1). Then n-1 = 80103945599 and n+1 are twin primes. [Post]