本文研究了孤立数的一个公开问题.利用初等数论方法,证明了对任意正整数k,存在无穷多个无平方因子的孤立数a,使a的不同素因数的个数等于k.
In this article,we study an open problem on anti-sociable numbers.By employing the elementary number theory,we prove that for any positive integer k,there exist infinity many isolated numbers a,which have no square factor,such that the number of unequal prime factors of a is just k.