#include<iostream>
#include<algorithm>
using namespace std;
typedef long long LL;
LL a[10000000] = { 0 };
void init(LL r) {
	LL s = 1;
	LL now = 1;
	for (LL i = 1; i <= r; i++) {
		a[i] = now;
		now++;
		if (now > s) {
			s++;
			now = 1;
		}//处理数组（从1到左右端.
		a[i] += a[i - 1];//前缀和
	}
}
int main() {
	ios::sync_with_stdio(false);
	LL t;
	cin >> t;
	LL mu = 0;
	LL l, r;
	LL last = 0;
	for (LL i = 0; i < t; i++) {
		cin >> l >> r;
		if (r > last)
			init(r);
		cout << a[r] - a[l - 1] << "\n";
		last = r;
	}
	return 0;
}