200111

Appears in sequences

• List of binary words of lengths 0, 1, 2, etc., including empty word, each prefixed by a 2.at n=38A319953
• Numbers k that are the representation of primes in base 3 and in base 4.at n=23A340290
• Ternary numbers consisting of a run of 2's, then a run of 0's, then a run of 1's.at n=12A371057
• Ternary numbers that are concatenated runs C(1)B(1)A(1)C(2)B(2)A(2)...C(k)B(k)A(k), where A(i) is a run of 1's, B(i) a run of 0's, and C(i) a run of 2's, for i = 1..k.at n=12A371109