灯和人的编号老老实实从 1 开始就好了

#include <bits/stdc++.h>
using namespace std;
bool light [50010];
int main()

{
	int qwer = 0, cnt =0;
	int numlight, numpers;
	while (qwer<50010)
	{
		light[qwer]=1;
		qwer++;
	}
	
	cin >> numlight>> numpers;
	for (int i= 1;i<=numpers; i++)
	{
		for (int j=1;j<=numlight;j++)
		{
			if(j%i==0)  light[j] = !light[j];
		}
		
	}
	 bool first = true;
    for (int k = 1; k <= numlight; k++) {
        if (light[k] == 0) {
            if (!first) cout << ","; 
            cout << k;
            first = false; 
        }
    }

	return 0;
}