220022domain: NAppears in sequencesDigital representation of m contains only either 1's or 2's (but not both 1's and 2's) and 0's, is palindromic and contains no singleton 2's, 1's or 0's.at n=10A061852Palindromes which are a concatenation of three palindromes, each of which has at least 2 digits.at n=10A368020