9楼正解

7楼做得不错。
6=1＋2＋3
28=1＋2＋4＋7＋14
496=1+2+4+8+16+31+62+124+248

还有个算法：
#include <stdio.h>
long MAX1=10000;
int complete(long x)
{
    long i,s=1;
    for (i=2;i<=x/2;i++)
        if (x%i==0)s+=i;
        if (x==s)
            return 1;
        else
            return 0;
}
void main()
{
    long t,i;
        for (t=2;t<=MAX1;t=t+2)
            if (complete(t))
            {
                printf(" %ld =1",t);
                for (i=2;i<=t/2;i++)
                    if (t%i==0)printf("+ld",i);
                    printf("\n");
            
            }

}