摘要
对于正整数n,设σ(n)、(?)(n)分别是n的约数和函数和Euler函数.本文证明了:当n是幂数 时,必有σ((?)(n))>6n/π2.
For any positive integer n, let σ and (?)( n) be the sum of divisors and the Euler function of n respectively. In this paper it is proved that if n is a powerful number, then σ((?)(n)) > 6 n/π2 .
出处
《华南师范大学学报（自然科学版）》
CAS
2001年第3期63-64,71,共3页
Journal of South China Normal University(Natural Science Edition)
