Question: Consider the process of taking a number, adding its digits, then adding the digits of the number derived from it , efc, untl the remaining

Consider the process of taking a number, adding its digits, then adding the digits of the number derived from it, efc, untl the remaining number has only one digh.
The number of iterations fequired to obtain a single digit from a number N is called the additive persistence of N.
Consider the process of taking a number, adding

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