摘要
如果一个正整数n的因数的倒数之和是一个正整数,我们称这个正整数n是一个调和数。该文证明了,如果 n是一个具有三个相异素因子的调和数,则 h=120或 672。
A positive integer n is called a harmonic number if the reciprocal sum of its divisors is an integer. In this paper we have proved that if n is a harmonic number with three distinct prime factors, then n = 120 or 672.
出处
《茂名学院学报》
2003年第4期7-8,17,共3页
Journal of Maoming College
基金
This program is supported by:National Natural Science Foundation of China(No.10271104),Guangdong Provincial Natural Science Foundation(No.011781)and Maoming College Natural Science Foundation.
