中国科学技术大学学报 ›› 2019, Vol. 49 ›› Issue (9): 704-710.DOI: 10.3969/j.issn.0253-2778.2019.09.003

• 原创论文 • 上一篇    下一篇

含有两个不同素因子的盈不完全数

陶甜甜   

  1. 安徽师范大学数学与统计学院,安徽芜湖 241003
  • 收稿日期:2018-06-10 修回日期:2018-10-10 出版日期:2019-09-30 发布日期:2019-09-30

On near-imperfect numbers with two distinct prime divisors

  1. TAO Tiantian, SUN Cuifang
  • Received:2018-06-10 Revised:2018-10-10 Online:2019-09-30 Published:2019-09-30
  • Contact: SUN Guifang
  • About author:TAO Tiantian, female, born in 1993, master. Research field: Number theory. E-mail: taotiantianahnu@sina.com

摘要: 对于素数方幂pα, 设可乘函数ρ(pα)=pα-pα-1+pα-2-…+(-1)α. 称满足条件2ρ(n)=n+d的正整数n为盈不完全数, 其中d是n的真因子.给出了含有两个不同素因子的所有盈不完全数.

关键词: 盈不完全数, 素因子, 可乘函数

Abstract: Let ρ be a multiplicative arithmetic function defined by ρ(pα)=pα-pα-1+pα-2-…+(-1)α for every prime power pα. For a positive integer n, n is called a near-imperfect number if 2ρ(n)=n+d where d is a proper divisor of n. Here all near-imperfect numbers with two distinct prime divisors were obtained.

Key words: near-imperfect number, prime divisor, multiplicative arithmetic function