标签：python
Let d(n) be defined as the sum of proper divisors of n (numbers less than
n which divide evenly into n).
If d(a) = b and d(b) = a, where a 
b, then a and b are an amicable pair and each of a and
b are called amicable numbers.
For example, the proper divisors of 220 are 1, 2, 4, 5, 10, 11, 20, 22, 44, 55 and 110; therefore d(220) = 284. The proper divisors of 284 are 1, 2, 4, 71 and 142; so d(284) = 220.
Evaluate the sum of all the amicable numbers under 10000.
翻译：
设d(n)是小于n的所有能整除n的整数的和。
若d(a) = b，d(b) = a且a ≠ b，那么a和b就是一对相亲数，a和b都被称作是相亲数。
例如，对于220，符合上述条件的整数有1, 2, 4, 5, 10, 11, 20, 22, 44, 55, 110，故d(220) = 284。类似地，对于284有1, 2, 4, 71, 142，因此d(284) = 220。
请求出10000以下的全部相亲数的和。
import math
def f(a):
m=0
for i in range(1,a/2+1):
if i!=a and a%i==0:
m+=i
return m
resu,tmp=0,0
for i in range(1,10000):
tmp=f(i)
if i!=tmp and i==f(tmp):
resu+=i
print resuprojecteuler---->problem=21----Amicable numbers,布布扣,bubuko.com
projecteuler---->problem=21----Amicable numbers
标签：python
原文地址：http://blog.csdn.net/china_zoujinyong/article/details/28589437
