15 29 56 108 208 400 

  • 758
  • 770
  • 784
  • 768
  • 778
  • Explanation:

    15×(2-1)29×(2-2)56×(2-4)108×(2-8)208×(2-16)400×(2-32)768

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15 29 56 108 208 400 
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