2111111
domain: N
Appears in sequences
- Leftmost 1 is converted to a 2, which then propagates one step at a time until it is rightmost; then it changes to a pair of 1's and the process repeats.at n=29A071762
- a(1) = 1, then the smallest number not included earlier and not a string of 1's such that the concatenation a(n), a(n+1) is a palindrome.at n=22A083122
- Keep only the first digit of each integer and concatenate them. The result is the concatenation of all integers of the sequence.at n=32A106000
- Smallest semiprime ending in exactly n 1's.at n=5A106656
- Least early bird number of order n.at n=19A133652
- Numbers with digital product = 2.at n=27A199986
- Composite numbers whose product of digits is 2.at n=20A201015
- List of Nyldon words over {1,2}.at n=23A328073
- List of co-Lyndon words on {1,2} sorted first by length and then lexicographically.at n=23A329318
- Sequence S of positive integers such that the successive digits d of S are the successive Levenshtein distances between two adjacent terms of S. When possible, S is always extended with the smallest positive integer not yet present.at n=39A367638
- Sequence S of positive integers such that the successive digits d of S are the successive Levenshtein distances between two adjacent terms of S. When possible, S is always extended with the smallest positive integer not yet present.at n=40A367638
- Sequence S of positive integers such that the successive digits d of S are the successive Levenshtein distances between two adjacent terms of S. When possible, S is always extended with the smallest positive integer not yet present.at n=41A367638
- Sequence S of positive integers such that the successive digits d of S are the successive Levenshtein distances between two adjacent terms of S. When possible, S is always extended with the smallest positive integer not yet present.at n=42A367638
- Sequence S of positive integers such that the successive digits d of S are the successive Levenshtein distances between two adjacent terms of S. When possible, S is always extended with the smallest positive integer not yet present.at n=43A367638