这个数列 是{s(n)/n}s(n)的定义是 n的质数因子的和, 比如8 = 2*2*2, s(8)=6 . 12=2*3*4 s(12)=9聚点的定义是:K is a cluster point of the sequence {an} ifgiven e > 0, |an-K|<e for infinitely many n.证明 1/n, n=1, 2, 3, 4, ... 都是{s(n)/n}的聚点