221211

Appears in sequences

• n expressed in Fibonacci binary-like number system using only 1's and 2's.at n=24A108960
• Numbers k such that k^p+p is prime, where p is product of the digits of k.at n=14A178327
• List of words over {1,2} with equal numbers of 1's and 2's.at n=26A214218
• Decimal representation of the x-axis, from the left edge to the origin, of the n-th stage of growth of the two-dimensional cellular automaton defined by "Rule 585", based on the 5-celled von Neumann neighborhood.at n=18A283138
• List of co-Lyndon words on {1,2} sorted first by length and then lexicographically.at n=18A329318