510221domain: NAppears in sequencesa(n) is the least integer k whose arithmetic derivative is equal to the n-th primorial, or 0 if no such k exists.at n=6A368703Numbers k for which k is a multiple of A276086(A003415(k)), where A003415 is the arithmetic derivative, and A276086 is the primorial base exp-function.at n=10A370115