问题描述：
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.
实现：
(function(){
var factor = function (n){
var arr = new Array();
for(var i = 1;i < n; i++)
{
if(n%i == 0 && arr.indexOf(i) == -1)
arr.push(i);
}
return arr;
}
var sumArr = function(arr){
var sum = 0 ;
for(var i = 0 ; i < arr.length; i++)
sum += arr[i];
return sum ;
}
for(var i = 2;i< 10000; i++)
{
var r1 = sumArr(factor(i));
var r2 = sumArr(factor(r1));
if(i == r2 && i != r1)
console.log("num1 : " + i + ", num2 : " + r1);
}
})();