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Sticky Note
Find the missing number: 1, 3, 7, 15, 31, 63, ______?
  1. 123
  2. 125
  3. 127
  4. 129
Explanation

Pattern: Multiply by 2 and add 1

1  

3 = 1 x 2 + 1  

7 = 3 x 2 + 1  

15 = 7 x 2 + 1  

31 = 15 x 2 + 1  

63 = 31 x 2 + 1  

? = 63 x 2 + 1 = 127  


Last verified on 11-07-2026

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