SOLUTION: Find the next three terms 1,3,7,15,31

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Question 993843: Find the next three terms 1,3,7,15,31
Answer by ikleyn(52788) About Me  (Show Source):
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 1 = 2 - 1,

 3 = 4 - 1,

 7 = 2%5E3-1 
15 = 2%5E4-1
31 = 3%5E5-1


General formula a%5Bn%5D = 2%5En-1.


Next terms


63 = 2%5E6-1
127 = 2%5E7-1
255 = 2%5E8-1