欧拉怎么样呢

证明设a=2^7,b=5,则a-b^3=128-125=3, 2^(2^5) 1=2^32 1=(2a)^4 1 =16a^4 1=(1 3×5)a^4 1 =(1 (a-b^3)b)a^4 1 =(1 ab-b^4)a^4 1 =(1 ab)a^4-a^4×b^4 1 =(1 ab)a^4-(a^2×b^2 1)(a^2×b^2-1) =(1 ab)a^4-(a^2×b^2 1)(ab 1)(ab-1) =(ab 1)(a^4-(a^2×b^2 1)(ab-1)) =641×6700417