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By multiplication

21 = 2

22 = 2 x 2 = 4

23 = 2 x 2 x 2 = 8

24 = 2 x 2 x 2 x 2 = 16

25 = 2 x 2 x 2 x 2 x 2 = 32

26 = 2 x 2 x 2 x 2 x 2 x 2 = 64

27 = 2 x 2 x 2 x 2 x 2 x 2 x 2 = 128

28 = 2 x 2 x 2 x 2 x 2 x 2 x 2 x 2 = 256

29 = 2 x 2 x 2 x 2 x 2 x 2 x 2 x 2 x 2 = 516

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14y ago

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