1123472

Appears in sequences

• Base 9 digits are, in order, the first n terms of the periodic sequence with initial period 2,1,0.at n=6A037526
• a(1)=1. a(n) = sum of earlier terms, a(k) (1<=k<=n-1), where gcd(a(k),n) is squarefree.at n=26A122169
• a(n) = Sum_{k=1..n} gcd(k, n)^4.at n=31A343498