The number of this column is arranged according to a certain rule. Fill in the number according to the rule: 1,5,21,85341, () Urgent need

Isn't that regular? Odd term × 2, even term × 2 + 1
1、2、5、10、21、42、85、170、341、682、.
Take only its odd number
Calculation: 682 * 2 + 1
=1365

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