Problem Q: 15-综合练习-完数

Problem Q: 15-综合练习-完数

Time Limit: 1 Sec  Memory Limit: 128 MB
Submit: 68  Solved: 38
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Description

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的因子为1、2、3,而6=1+2+3,因此6是"完数"。 编程序找出N之内的所有完数,并按下面格式输出其因子:

Input

N

Output

? its factors are ? ? ?

Sample Input

1000

Sample Output

6 its factors are 1 2 3 
28 its factors are 1 2 4 7 14 
496 its factors are 1 2 4 8 16 31 62 124 248 

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