a(n) = Sum_{d|n} phi(d^n), where phi() is the Euler totient function (A000010).
A321349
a(n) = Sum_{d|n} phi(d^n), where phi() is the Euler totient function (A000010).
Terms
- a(0) =1a(1) =3a(2) =19a(3) =137a(4) =2501a(5) =16071a(6) =705895a(7) =8421505a(8) =258293449a(9) =4007813013a(10) =259374246011
External references
- oeis: A321349