12112121

Appears in sequences

• Fixed point of the morphism 1 -> 121, 2 -> 12, starting from 1.at n=2A068490
• Define the "Fibonacci" morphism f: 1->12, 2->1 and let a(0) = 2; then a(n+1) = f(a(n)).at n=5A106750
• a(n) = length-n prefix of the Fibonacci word A003842.at n=7A214317