MOD = 998244353
N = 10 ** 5 + 10
fact = [1] * (N + 1)
rfact = [1] * (N + 1)
r = 1
for i in range(1, N + 1):
    fact[i] = r = r * i % MOD
rfact[N] = r = pow(fact[N], MOD - 2, MOD)
for i in range(N, 0, -1):
    rfact[i - 1] = r = r * i % MOD

def comb(n, k):
    return fact[n] * rfact[k] * rfact[n - k] % MOD

T = int(input())

for _ in range(T):
    if N == 1 or N == 2:
        print(N)
        continue
    N, K = map(int, input().split())
    c = (N + 1) ** 2 - 4 * K
    d = int(c ** 0.5)
    for i in range(d - 1, d + 2):
        if i * i == c:
            break
    else:
        print(0)
        continue
    ans = 0
    a = (N + 1 + i) // 2
    ans += comb(N, a)
    if i != 0:
        a = (N + 1 - i) // 2
        ans += comb(N, a)
    ans %= MOD
    print(ans)