2

This looks like several different sequences combined to me: The total sequence is: 2, 4, 5, 3, 10, 11, 13, 7, 5, 28, 29, 31, 35 But that can be split into, with some of the intermediary numbers dropped 2, 4, 5, 10, 11, 13 and 28, 29, 31, 35 Each of these groups follow a $2^{n-1}$ pattern: $1 + 2^{1-1} = 1 + 1 = 2$ $3 + 2^{1-1}, 3 + 2^{2-1} = 3 + 1, 3 + 2 = ...


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