#include<stdio.h>int main(){ int i, j; for (i = 1; i <= 1000; i++) { int sum = 0; for (j = 1; j < i; j++) { if (i % j == 0) sum = sum + j; } if (sum == i) printf("%d\n", i); } printf("\n"); return 0;}int main(){ double sn = 0; int n = 0; while (n++<= 100000) { sn = 1.0 / n + sn; } printf("%f", sn); return 0;}