391320domain: NAppears in sequencesa(n) = A027113(n, 2n-10).at n=11A027128a(n) = Sum_{d|8} phi(d)*n^(8/d).at n=5A054607a(n) = Sum_{d|n} phi(d)*5^(n/d).at n=8A054612Triangle T(n,k) = Sum_{d|n} phi(d)*k^(n/d).at n=32A054618