i is a ?

#include <stdio.h>
int main(void) {
for (int i = 2; i < 10000; i += 2) {
int sum = 1;
for (int j = 2; j <= i/2; j++) {
if (i % j == 0) {
sum += j;
}
}
if (sum == i) {
printf("%d is a ?\n",i);
}
}
return(0);
}