211221
domain: N
Appears in sequences
- List of words over {1,2} with equal numbers of 1's and 2's.at n=20A214218
- Words u such that uu is a factor of the Thue-Morse word A001285.at n=9A225188
- Unique representation of nonnegative numbers by iterated tribonacci A, B and C sequences.at n=58A316713
- List of Nyldon words over {1,2}.at n=18A328073
- Smallest number with a n-character traditional Japanese notation.at n=10A384792