This number is a prime.
A prime factor of F16 [2^(2^16)+1 or 2^65536+1 or 2^2^2^2^2+1]. It was discovered by J. W. Selfridge in 1953. [Dobb]
A prime factor of F16 [2^(2^16)+1 or 2^65536+1 or 2^2^2^2^2+1]. It was discovered by J. W. Selfridge in 1953. [Dobb]