a(n) = Sum_{d|n} phi(d^d), where phi(n) is the Euler totient function A000010(n).
A226459
a(n) = Sum_{d|n} phi(d^d), where phi(n) is the Euler totient function A000010(n).
Terms
- a(0) =1a(1) =3a(2) =19a(3) =131a(4) =2501a(5) =15573a(6) =705895a(7) =8388739a(8) =258280345a(9) =4000002503a(10) =259374246011
External references
- oeis: A226459