bcpowmod() Raise an arbitrary precision number to another, reduced by a specified modulus

Use the fast-exponentiation method to raise x to the power y with respect to the modulus modulus. The optional scale can be used to set the number of digits after the decimal place in the result.

Because this method uses the modulus operation, non-natural numbers may give unexpected results. A natural number is any positive non-zero integer.

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J. Jeyaseelan
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