May I ask what went wrong with this and how to correct it

#include<stdio.h>
int main(){
    int n,i=1,j,count=0;
    int a[1001];
    while(~sacnf("%d",&n)){
        for(i=2;;i++){
            if(n%i==0){
            break;
            }else{
                    a[j++]=i;
                    if(j==1000)break;
                }
            }
        for(j=1;j<=n;j++){
            if(j==1){
            printf("%d",a[j]);
            }else{
                printf(",%d",a[j]);
            }
        }
        
            
                
        }
}

Task Description
Programming finds the first 1000 primes and stores them in an array, then inputs an integer N and outputs the value of the NTH prime.

Input format:
Input multiple groups of data, which are integers separated by several Spaces.

Output format:
For each n in the input data, output the value of the NTH prime number, with multiple outputs separated by commas.

input sample: < br / > 1, 2, 3, 4, 5 4 3 output sample: < br / > < br / > 2,3,5,7,11,7,5 < br / > input sample: < br / > 5 8 9 10, 100 200
Output Example :
11,19,23,29,541,1223
Input example :
996 997 998 999 1000 output sample: < br / > < br / > 7879788 3790 1790 7791 9