12122112domain: NAppears in sequencesa(n) contains n digits (either '1' or '2') and is divisible by 2^n.at n=7A053312Smallest multiple of 2^n using only 1's and 2's.at n=9A207778Smallest multiple of 2^n using only 1's and 2's.at n=10A207778Smallest multiple of 2^n using only 1's and 2's.at n=11A207778