PowerizeBigInt returns (e, p) such that e is the smallest number for which p == b^e is greater or equal n. For n < 0 or b < 2 (0, nil) is returned. NOTE: Run time for large values of n (above about 2^1e6 ~= 1e300000) can be significant and/or unacceptabe. For any smaller values of n the function t
(b, n *big.Int)
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