#include <bits/stdc++.h>
#define dd(x) cout << #x << "\n"
#define d(x) cout << #x  << ": " << x << "\n"
#define SZ(x) ((int)(x).size())
using namespace std;
#define int long long
using pii = pair<int, int>;
using vpii = vector<pii>;
using vi = vector<int>;
using vii = vector<vector<int>>;
using a3 = array<int, 3>;
using ll = long long;
const int inf = 0x3f3f3f3f3f3f3f3fLL;

#define MULTI_TEST

const int N = 1e6 + 6;
int isnt[N], ist[N], f[N];
vector<int> prime, p2;
int px[N];

void sieve(int n) {
    isnt[1] = isnt[0] = 1;
    for(int i = 2; i <= n; i++) {
        if(!isnt[i]) prime.push_back(i);
        for(auto p : prime) {
            if(i * p > n) break;
            isnt[i * p] = 1;
            if(i % p == 0) break;
        }
    }
}

void calc(int n) {
    f[1] = 1;
    ist[1] = ist[0] = 1;
    for(int i = 2; i <= n; i++) {
        if(!ist[i]) prime.push_back(i);
        for(auto p : prime) {
            if(i * p > n) break;
            ist[i * p] = 1;

            if(p >= 71) f[i * p] = f[i];
            else f[i * p] = f[i] * px[p];

            if(i % p == 0) break;
        }
    };
}

void clear(int n) {
    for(int i = 1; i <= n; i++) {
        f[i] = 1;
        ist[1] = 0;
    }
}

void solve() {
    int n, k; cin >> n >> k;
    if((k + n) & 1) {
        cout << "-1" << "\n";
        return ;
    }
    clear(n);

    for(int i = 1; i <= n; i++) px[i] = 1;

    int cnt = 0;
    for(int i = n / 2 + 1; i <= n; i++) {
        if(!isnt[i]) ++cnt;
    }

    vector<int> pp{2,3,5,7,11,13,17,19,23,29,31,37,41,43,47,53,59,61,67,71};

    for(int i = 0; i < 20; i++) {
        px[i] = -1;
        calc(n);
        int now = 0;
        for(int i = 1; i <= n; i++) now += f[i];
        clear(n);

        if(now < k) {
            px[i] = 1;
        }
    }

    calc(n);
    int now = 0;
    for(int i = 1; i <= n; i++) now += f[i];
    

    if((now - k) / 2 > cnt) assert(false);
    else if(cnt) {
        for(int i = 1; i <= n; i++) {
            if(i >= n / 2 + 1 && !isnt[i]) {
                f[i] = -1;
                cnt -= 2;
                if(cnt <= 0) break;
            }
        }
    }

    
    for(int i = 1; i <= n; i++) {
        cout << f[i] << " ";
    }
    clear(n);
    cout << "\n";
}

signed main() {
    sieve(1e6);
    ios::sync_with_stdio(false); cin.tie(0);

#ifdef MULTI_TEST
    int T; cin >> T;
#else
    int T = 1;
#endif
    while(T--) solve();
    return 0;
}

/*
4
4 2
10 0
10 1
10 10
*/