23579476911domain: NAppears in sequencesa(n) = Sum_{d|n} phi(d^phi(d)).at n=10A179117a(n) = 10*11^n+1.at n=9A199764a(n) = Sum_{k=1..n} (n/gcd(k,n))^(n/gcd(k,n) - 2).at n=10A342411a(n) = Sum_{k=1..n} (n/gcd(k,n))^(n-2).at n=10A342412