import sys, random
input = lambda : sys.stdin.readline().rstrip()


write = lambda x: sys.stdout.write(x+"\n"); writef = lambda x: print("{:.12f}".format(x))
debug = lambda x: sys.stderr.write(x+"\n")
YES="Yes"; NO="No"; pans = lambda v: print(YES if v else NO); INF=10**18
LI = lambda : list(map(int, input().split())); II=lambda : int(input()); SI=lambda : [ord(c)-ord("a") for c in input()]
def debug(_l_):
    for s in _l_.split():
        print(f"{s}={eval(s)}", end=" ")
    print()
def dlist(*l, fill=0):
    if len(l)==1:
        return [fill]*l[0]
    ll = l[1:]
    return [dlist(*ll, fill=fill) for _ in range(l[0])]

t = II()
M = 998244353
for _ in range(t):
    n,x = list(map(int, input().split()))
    n += 1
    if x%2:
        ans = n//2
    else:
        if n<=x:
            ans = n//2
        else:
            d,m = divmod((n-x), x+3)
            ans = x//2 + (x//2+2)*d + (m+1)//2
    print(ans%M)