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Note: The following question follows a definite pattern. Observe the same and fill in the blank with suitable answer.
$$2 + \sqrt{5}, 9 + 4 \sqrt{5}, .............. , 161 + 72\sqrt{5}$$
$$18 + 16\sqrt{5}$$
$$38 + 17\sqrt{5}$$
$$64 + 32\sqrt{5}$$
$$72 + 64\sqrt{5}$$
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