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Find the missing (?) in the series.
3, 5, 9, ?, 33, 65
$$2^1+1=2+1=3$$
$$2^2+1=4+1=5$$
$$2^3+1=8+1=9$$
$$2^4+1=16+1=17$$
$$2^5+1=32+1=33$$
$$2^6+1=64+1=65$$
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