a(n) = floor(sqrt(phi(10^n)*sigma(10^n) + 10^(3*n))).
A065552
a(n) = floor(sqrt(phi(10^n)*sigma(10^n) + 10^(3*n))).
Terms
- a(0) =1a(1) =32a(2) =1004a(3) =31637a(4) =1000048a(5) =31622932a(6) =1000000496a(7) =31622778176
External references
- oeis: A065552