222001

Appears in sequences

• Pseudoprimes to base 3, written in base 3.at n=4A258189
• Ternary numbers consisting of a run of 2's, then a run of 0's, then a run of 1's.at n=17A371057
• 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=18A371109