import sys
input = sys.stdin.readline

T=int(input())

for tests in range(T):
    L,R=list(map(int,input().split()))

    ANS=-1

    if L==0:
        ANS=0

    for i in range(40):
        x=2**i

        if L<=x-1<x<=R:
            ANS=max(ANS,x*(x-1))

    print(ANS)