/* -*- coding: utf-8 -*-
 *
 * 2896.cc:  No.2896 Monotonic Prime Factors - yukicoder
 */

#include<cstdio>
#include<vector>
#include<algorithm>

using namespace std;

/* constant */

const int MAX_A = 320;
const int MAX_N = MAX_A * 18;
const int MOD = 998244353;

/* typedef */

using vb = vector<bool>;
using vi = vector<int>;

template<const int MOD>
struct MI {
  int v;
  MI(): v() {}
  MI(int _v): v(_v % MOD) { if (v < 0) v += MOD; }
  MI(long long _v): v(_v % MOD) { if (v < 0) v += MOD; }

  explicit operator int() const { return v; }
  
  MI operator+(const MI m) const { return MI(v + m.v); }
  MI operator-(const MI m) const { return MI(v + MOD - m.v); }
  MI operator*(const MI m) const { return MI((long long)v * m.v); }

  MI &operator+=(const MI m) { return (*this = *this + m); }
  MI &operator-=(const MI m) { return (*this = *this - m); }
  MI &operator*=(const MI m) { return (*this = *this * m); }

  bool operator==(const MI m) const { return v == m.v; }
  bool operator!=(const MI m) const { return v != m.v; }

  MI pow(int n) const {  // a^n % MOD
    MI pm = 1, a = *this;
    while (n > 0) {
      if (n & 1) pm *= a;
      a *= a;
      n >>= 1;
    }
    return pm;
  }

  MI inv() const { return pow(MOD - 2); }
  MI operator/(const MI m) const { return *this * m.inv(); }
  MI &operator/=(const MI m) { return (*this = *this / m); }
};

using mi = MI<MOD>;
using vmi = vector<mi>;

/* global variables */

vb primes;
vi pnums;
vmi fs, invfs;

/* subroutines */

int gen_primes(int maxp) {
  primes.assign(maxp + 1, true);
  primes[0] = primes[1] = false;

  int p;
  for (p = 2; p * p <= maxp; p++)
    if (primes[p]) {
      pnums.push_back(p);
      for (int q = p * p; q <= maxp; q += p) primes[q] = false;
    }
  for (; p <= maxp; p++)
    if (primes[p]) pnums.push_back(p);
  return (int)pnums.size();
}

int pdnum(int n) {
  int sum = 0;

  for (auto pi: pnums) {
    if (pi * pi > n) {
      if (n > 1) sum++;
      return sum;
    }

    while (n % pi == 0) n /= pi, sum++;
  }
  return -1;
}

inline mi nck(int n, int k) {  // nCk % MOD
  if (n < k || k < 0) return 0;
  return fs[n] * invfs[n - k] * invfs[k];
}

inline mi nhk(int n, int k) {  // nHk % MOD
  if (n < 0 || k < 0) return 0;
  return nck(n + k - 1, k);
}

void prepare_fracs(int n) {
  fs.resize(n + 1), invfs.resize(n + 1);
  fs[0] = invfs[0] = 1;
  for (int i = 1; i <= n; i++) {
    fs[i] = fs[i - 1] * i;
    invfs[i] = fs[i].inv();
  }
}

/* main */

int main() {
  gen_primes(MAX_A);
  prepare_fracs(MAX_N);
  
  int qn;
  scanf("%d", &qn);

  int l = 0;
  while (qn--) {
    int a, b;
    scanf("%d%d", &a, &b);

    l += pdnum(a);
    mi c = nhk(b, l - b);

    printf("%d\n", (int)c);
  }

  return 0;
}