2212121
domain: N
Appears in sequences
- Fibonacci sequence in base 2 of the alternate number system.at n=12A085652
- Shortest (x+1,2x)-code of n.at n=22A233135
- List of co-Lyndon words on {1,2} sorted first by length and then lexicographically.at n=31A329318
- Positive integers m such that m * (m+1) contains at least 8 decimal digits that are in neither m nor m+1.at n=12A381247