mod = 998244353
query = int(input())
dp = []
for i in range(2026):
  dp.append([0]*2026)
dp[0][1] = 1
for i in range(2,2026):
  for j in range(2026):
    if j-1 >= 0 and j+1<2026:
      dp[j][i] = (dp[j-1][i-1]+dp[j+1][i-1])%mod
    elif j+1<2026:
      dp[j][i] = dp[j+1][i-1]
    else:
      dp[j][i] = dp[j-1][i-1]
wari = []
for i in range(202501):
  wari.append([])
for i in range(1,2026):
  num = 1
  while i * num <= 202500:
  	wari[i*num].append(i)
  	num += 1
for _ in range(query):
  n,a = map(int,input().split())
  ans = 0
  for i in wari[a]:
    ans = (ans+dp[i][n])%mod
  print(ans)