text: #include <stdio.h>
  
  #define N 10000
  
  main() {
    int i, j, a[N];
    for (i = 2; i < N; i++) a[i] = 1;
    for (i = 2; i < N; i++)
      if (a[i])
        for (j = i; i * j < N; j++) a[i * j] = 0;
    for (i = 2; i < N; i++)
      if (a[i]) printf("%4d ", i);
    printf("\n");
  }
  