已知数列{an}满足;a1=m(m为正整数)a(n+1)=an/2(an为偶数),a(n+1)=3an+1(an为奇数),若a4=2,求m

问题描述:

已知数列{an}满足;a1=m(m为正整数)a(n+1)=an/2(an为偶数),a(n+1)=3an+1(an为奇数),若a4=2,求m

往回推导,a4=3*a3+1=2,
so,a3=1/3=a2/2
then,a2=2/3=3*a1+1
so,a1=-1/9