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var startNum = 10000;
var endNum = 99999;
var tmp = startNum;
var exchangeValue,$a;
var result=[];
for(tmp;tmp<endNum+1;tmp++){
$a = tmp+"";
exchangeValue = parseInt($a[4]+$a[1]+$a[2]+$a[3]+$a[0]);
if(4*tmp === exchangeValue){
result.push(tmp)
}
}
var $c = result;
for(var i=10001; i<25000; i++)
if(i*4==i.toString().replace(/(\d)(\d\d\d)(\d)/,"$3$2$1"))
document.write(i," ");
结果是无解