9999000domain: NAppears in sequencesNumbers of the form 10^(m-k)*(10^(m+k+1)-10^k), m, k >= 0.at n=3A083909Number of length n primitive (=aperiodic or period n) 10-ary words which are earlier in lexicographic order than any other word derived by cyclic shifts of the alphabet.at n=7A320075