40354335

Appears in sequences

• a(n) = Sum_{d|9} phi(d)*n^(9/d).at n=7A054608
• a(n) = Sum_{d|n} phi(d)*7^(n/d).at n=9A054614
• Triangle T(n,k) = Sum_{d|n} phi(d)*k^(n/d).at n=42A054618