英语翻译a sphere of radius r inside a cube touches each one of the six sides of the cube.let a "prd" number be defined as one in which the product of the positive divisors of the number,not including the number itself,is greater than the number.
问题描述：
英语翻译
a sphere of radius r inside a cube touches each one of the six sides of the cube.
let a "prd" number be defined as one in which the product of the positive divisors of the number,not including the number itself,is greater than the number.
答
一个半径为r的球体处于一个正方体之中,球和正方体每个面都相接触
让我们把"prd"数定义为一个这样的数:它的所有正因数的乘积(不包括这个数本身)大于这个数本身.