find false
x=2**(n-1)
? ? n=n+1
? ? sum=sum+x
? ? if n>20：
? ? break
qq_凮殘淩度zkm_03844082
2016-10-01
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2016-10-01
Do you want something like below?
n = 1
sum = 0
while True:
? ? x = 2**(n-1)
? ? n = n + 1
? ? sum = sum + x
? ? if n > 20:
? ? ? ? break
print sum