212221

Appears in sequences

• "DFK" (bracelet, size, unlabeled) transform of 2,1,1,1...at n=43A032215
• Lucky numbers that are concatenations of n with n + 9.at n=16A032659
• k th digit of a(n) = number of different digits within 2 places of k (not including k).at n=21A039987
• k th digit of a(n) is the number of different digits within 3 of k (not including k).at n=19A039989
• Numbers for which the sum of reciprocals of square of digits is an integer.at n=20A182452
• Shortest (x+1,2x)-code of n.at n=24A233135
• Concatenation of n, n+1 and n.at n=20A261618
• Decimal representation of the diagonal from the corner to the origin of the n-th stage of growth of the two-dimensional cellular automaton defined by "Rule 161", based on the 5-celled von Neumann neighborhood.at n=34A286165
• List of Nyldon words over {1,2}.at n=21A328073