Observe the sequence 6, 7, 9, 13, 21, then fill in the rule on the horizontal line (that is, the next number)

six
7=6+1
9=7+2
13=9+4
21=13+8
It can be observed that the following addends are: 1,2,4,8, which are all to the power of 2
So, the next number should be the previous number plus 16
That is: 37 = 21 + 16
A: the next number is 37

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