This question of counting the number of lattice points a distance sqrt(N) away from the origin involves adding up the value of this simple function over all divisors of N. Now, remember why we're doing all of this.
这个计算距原 sqrt(N) 距离的格的问题涉及将这个简单函的值与 N 的所有除相加。 现在,请记住我们为什么要做这一切。