#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
int main(){
    int q;
    cin>>q;
    while(q--){
        int x,a;
        cin>>x>>a;
        vector<pair<double,ll>> tank(a);
        for(int i=0;i<a;i++){
            tank[i]={(double)(i+1)+(double)x/(i+1),(ll)i+1};
        }
        sort(tank.rbegin(),tank.rend());
        int pos=a-1;
        ll mp=0;
        while(a){
            while(a<tank[pos].second&&pos>=0)pos--;
            a-=tank[pos].second;
            mp+=(tank[pos].second)*(tank[pos].second)+x;
            pos--;
        }
        cout<<mp<<endl;
    }
}