1,3,7,15,31,63,127,255,511,1023的第N个是多少?

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1,3,7,15,31,63,127,255,511,1023的第N个是多少?
1,3,7,15,31,63,127,255,511,1023的第N个是多少?

1,3,7,15,31,63,127,255,511,1023的第N个是多少?
2的n次方-1

2的N次方-1

2^n-1