How long must the paper be to fold it n times?

In 2002, Britney Gallivan folded paper in half 12 times, which was thought impossible at the time. Her formula gives the minimum length for folding n times in one direction: L = (πt/6)(2ⁿ+4)(2ⁿ−1), where t is the paper's thickness.

Thickness t (mm):   folds n:

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