やってる事しょぼいけど３行って事で勘弁

#include<iostream.h>
int a,b=2;void k(){if(a%b==0 && (a/=b))cout<<b<<",";else return;}
void main(){cout<<"数入れろ";cin>>a;k();b--;while(a!=1 &&(b+=2))k();return;}