9990234375domain: NAppears in sequencesString of digits encountered in decimal expansion of successive ratios k/(k+1), treating only non-repeating expansions, with decimal point and leading and trailing zeros removed.at n=28A156703a(n) = 10^n - 5^n.at n=10A248340a(n) = (4^n - 1)*n^(2*n).at n=5A356568