3(2^2+1)(2^4+1)(2^8+1)…(2^128+1)+1=?

问题描述:

3(2^2+1)(2^4+1)(2^8+1)…(2^128+1)+1=?

3=2^2-1
代入3(2^2+1)(2^4+1)(2^8+1)…(2^128+1)+1
=(2^2-1)(2^2+1)(2^4+1)(2^8+1)…(2^128+1)+1
=(2^4-1)(2^4+1)(2^8+1)…(2^128+1)+1
.
.
=(2^128-1)(2^128+1)+1
=(2^128)²-1+1
=2^256