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#include <fstream>
using namespace std;
ifstream cin("consecutive.in");
ofstream cout("consecutive.out");
int v[10000001],w[10000001];
int main()
{
int n,m,t,r;
cin>>t;
while(t--)
{
r=0;
cin>>n;
for(int i=2;i*i<n*2;i++)
{
if((n*2)%i==0)
{
m=((2*n)/i-i+1);
if(m%2==0)
{
r++;
v[r]=((2*n)/i-i+1)/2;
w[r]=((2*n)/i-i+1)/2+i-1;
}
}
}
cout<<r<<'\n';
for(int i=1;i<=r;i++)
cout<<v[i]<<' '<<w[i]<<'\n';
}
return 0;
}