const MOD: usize = 1e9 as usize + 7;

fn power(base: usize, times: usize) -> usize {
    if times == 0 { return 1usize; }
    if times == 1 { return base; }
    let temp = power(base, times/2);
    temp * temp % MOD * power(base, times%2) % MOD
}

fn solve(div6: usize) -> usize {
    let mut nm = String::new();
    std::io::stdin().read_line(&mut nm).ok();
    let nm: Vec<usize> = nm.trim().split_whitespace().map(|s| s.parse().unwrap()).collect();
    let n = nm[0];
    let m = nm[1];

    let total = power(n, m);
    let total = total * (total + 1) / 2 % MOD;
    // n * (n + 1) * (2 * n + 1) / 6
    let upper = power(n, m/2) * if m % 2 == 1 { (n as f64).sqrt().floor() as usize } else { 1 } % MOD;
    let sqsum = upper * div6 % MOD * (upper + 1) % MOD * (2 * upper + 1) % MOD;
    (MOD + total - sqsum) % MOD
}

fn main() {
    let mut t = String::new();
    std::io::stdin().read_line(&mut t).ok();
    let t: usize = t.trim().parse().unwrap();
    let mut result = Vec::with_capacity(t);
    let div6 = power(6, MOD-2);
    for _ in 0..t {
        result.push(solve(div6));
    }
    for &v in result.iter() {
        println!("{}", v);
    }
}