thank you

Dear friends,I learnt a lot here .Today I also put a question to you.F(3)=3,as 111 can divided by3,if 11111...111(n 1) can devided by a and any m 1(m20,1 will be killed.so 3a4.we get p1=p2=.5,p3=p4=0 and p5=1.pi means i's probability killed.Thank you all.I'll very busy future.good by