81784domain: NAppears in sequencesa(n) = Sum_{k=0..2n} (k+1) * A027113(n, k).at n=8A027137Exponent of least power of 2 having exactly n consecutive 2's in its decimal representation.at n=9A131536Least k such that 2^k has at least n consecutive 2's in its decimal representation.at n=9A259089