279272domain: NAppears in sequencesExponent of least power of 2 having exactly n consecutive 2's in its decimal representation.at n=10A131536Numbers k such that k and k^2 use only the digits 2, 4, 7, 8 and 9.at n=36A137107Least k such that 2^k has at least n consecutive 2's in its decimal representation.at n=10A259089