**Least k such that the k-th arithmetic derivative of n is zero, or 0 if no k exists.**

*1, 2, 2, 0, 2, 3, 2, 0, 4, 3, 2, 0, 2, 5, 0, 0, 2, 5, 2, 0, 4, 3, 2, 0, 4, 0, 0, 0, 2, 3, 2, 0, 6, 3*

*2 seqfan posts*

Index of A-numbers in seqfan: by ascending order by month by frequency by keyword

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