一个数如果恰好等于它的因子之和，这个数就称为“完数”。例如6=1＋2＋3.编程 　　　找出1000以内的所有完数。-A few if it is equal to the sum of its factors, this number is called" the perfect number". For example, 6 = 123. ProgrammingFind out 1000 all within the end of the number of.