## https://yukicoder.me/problems/no/3403

MOD = 998244353
       

class CombinationCalculator:
    """
    modを考慮したPermutation, Combinationを計算するためのクラス
    """    
    def __init__(self, size, mod):
        self.mod = mod
        self.factorial = [0] * (size + 1)
        self.factorial[0] = 1
        for i in range(1, size + 1):
            self.factorial[i] = (i * self.factorial[i - 1]) % self.mod
        
        self.inv_factorial = [0] * (size + 1)
        self.inv_factorial[size] = pow(self.factorial[size], self.mod - 2, self.mod)

        for i in reversed(range(size)):
            self.inv_factorial[i] = ((i + 1) * self.inv_factorial[i + 1]) % self.mod

    def calc_combination(self, n, r):
        if n < 0 or n < r or r < 0:
            return 0

        if r == 0 or n == r:
            return 1
        
        ans = self.inv_factorial[n - r] * self.inv_factorial[r]
        ans %= self.mod
        ans *= self.factorial[n]
        ans %= self.mod
        return ans
    
    def calc_permutation(self, n, r):
        if n < 0 or n < r:
            return 0

        ans = self.inv_factorial[n - r]
        ans *= self.factorial[n]
        ans %= self.mod
        return ans
        

def main():
    T = int(input())
    questions = []
    max_a = 0
    for _ in range(T):
        N, A = map(int, input().split())
        questions.append((N , A))
        max_a = max(max_a, A)
    
    # 約数列挙
    divisors_list = [[] for _ in range(max_a + 1)]
    for d in range(1, max_a + 1):
        x = d
        while x <= max_a:
            divisors_list[x].append(d)
            x += d
    
    # 本計算
    combi = CombinationCalculator(N, MOD)
    for N, A in questions:
        ans = 0
        for d in divisors_list[A]:
            q = A // d

            if (N - 1) - q >= 0 and ((N - 1) - q) % 2 == 0:
                x = ((N - 1) - q) // 2

                y = (combi.calc_combination(N - 1, x) - combi.calc_combination(N - 1, x - 1)) % MOD
                ans += y
                ans %= MOD
        print(ans)



        





    



if __name__ == "__main__":
    main()