25274655domain: NAppears in sequencesNumbers m such that the sum of the digits (sod) of m, m^2, m^3, ..., m^9 are in arithmetic progression: sod(m^(k+1)) - sod(m^k) = f for k=1..8.at n=28A257969Least number k such that j*Sd(k) = Sd(k^j) for 1 <= j <= n, where Sd(k) is the sum of the digits of k.at n=8A273844