输出不来结果，请问哪里有问题

#include<stdio.h>
int main()
{
	int L, a[100001], b[10001]={0}, i, j;
	int sum;
	int x,r=0;
	scanf("%d", &L);
	for (i = 1;i<=100000; i++)
	{
		a[i] = i;
	}
	for (i=3;;i++)
		for (j=2;j<i; j++)
		{
			if (a[i] % a[j] == 0)
			{
				b[i] = a[i];
			}
		}
	for (i = 1;; i++)
	{
		sum = sum + a[i] - b[i];
		if (sum > L)
			break;
	}
	for (j = 1; j <= i-1 ; j++)
	{
		x = a[j] - b[j];
		if (x != 0)
		{
			printf("%d\n", x);
			r++;
		}
		printf("%d\n", r);
		return 0;
	}
}