a(n) = A002088(10^n) = Sum_{k <= 10^n} phi(k), sum of the Euler totients phi = A000010.
A064018
a(n) = A002088(10^n) = Sum_{k <= 10^n} phi(k), sum of the Euler totients phi = A000010.
Terms
- a(0) =1a(1) =32a(2) =3044a(3) =304192a(4) =30397486a(5) =3039650754a(6) =303963552392
External references
- oeis: A064018