2 N-th power online batch calculation.

An index is a form of arithmetic of a rational number, which represents the relationship of several factors multiplied by the same factor:

The 3rd power of 2 = 2 * 2 * 2 = 8, 2 of the 3rd power where 2 is the base, 3 is the exponent, and 8 is the power, which is the result.

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