214821521domain: NAppears in sequencesNumbers m such that m' = d_1^1 + d_2^2 + ... + d_k^k where d_1, d_2, ..., d_k are the digits of m, with MSD(m) = d_1 and LSD(m) = d_k, and m' is the arithmetic derivative of m.at n=19A284812