    #include<bits/stdc++.h>
    #define ii pair<int,int>
    #define s second
    #define f first
    #define ll long long
    #define ci pair<char,int>
    #define loob(i,n) for(int i=0 ;i<n ;++i)
    #define loob1(i,n) for(int i=1 ;i<=n ;++i)
    #define loobc(i,n) for(int i='a' ; i<'c' ;++i)
    #define rloob(i,n) for(int j=n-1 ;j>=0 ;--j)
    #define vi vector<int>
    #define sz size()
    #define pb push_back
    #define pp pop_back
    #define oo  0x3f3f3f3f3f3f3f3f
    #define intvector vector<int>
    #define llvector vector<long long>
    #define intset set<int>
    #define llset set<long long>
    #define intmap map<int,int>
    #define llmap map<long long ,long long>
    #define ilmap map<int ,long long>
    #define limap map<long long ,int >
using namespace std;
void GO(){
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    cout.tie(0);
}
int dx[4]={1,-1,0,0};
int dy[4]={0,0,1,-1};
int main(){
    GO();
    int t; scanf("%d",&t);
    while(t--)
    {
        int n;scanf("%d",&n);
        vector<ii>v;
        if(n<=60)
        {
            for(int i=3 ;i<n ;++i)v.pb({i,i+1});
            int hold=n;
            while(hold!=1)
            {
                v.pb({n,2});
                hold=(hold+1)/2;
            }
            cout<<v.sz<<endl;
            for(auto x :v)cout<<x.f<<" "<<x.s<<endl;
            continue;
        }
        for(int i=3 ;i<n ;++i)
        {
            if(i==60||i==4)continue;
            v.pb({i,i+1});
        }
        int hold=n;
        while(hold!=1)
        {
            v.pb({n,60});
            hold=(hold+59)/60;
        }
        cout<<v.sz+5<<endl;
        for(auto x :v)cout<<x.f<<" "<<x.s<<endl;
        cout<<"60 4"<<endl;
        cout<<"60 4"<<endl;
        cout<<"60 4"<<endl;
        cout<<"4 2"<<endl;
        cout<<"4 2"<<endl;
    }
return 0;
}
