SOLUTION: Please help me find the next number in the sequence, 1,7,31,127,...

Question 216244: Please help me find the next number in the sequence,
1,7,31,127,...
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
find the next number in the sequence,
1,7,31,127,...
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It looks like one less than powers of 2.
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For example:
1st: 1 = 2^(1)-1 = 1
2nd: 7 = 2^(3)-1 = 7
3rd: 31= 2^(5)-1 = 31
4th: 127 = 2^(7)-1 = 127 ...
...
...
nth: 2^(2n-1)-1
-------------------------------
5th: 2^(9)-1 = 511
==========================
Cheers,
Stan H.
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