sum = 0
x = 1
n = 1
while True:
sum=sum+x
x=x*2
n=n+1
if n>20:
break
print sum
1
3
7
15
31
63
127
255
511
1023
2047
4095
8191
16383
32767
65535
131071
262143
524287
举报
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sum = 0
x = 1
n = 1
while True:
sum=sum+x
x=x*2
n=n+1
if n>20:
break
print sum
1
3
7
15
31
63
127
255
511
1023
2047
4095
8191
16383
32767
65535
131071
262143
524287
2014-11-04
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