Positive integers n such that S(n) divides n, where S(n) is the sum of the iterates of the Euler phi-function of n, that is, S(n) = phi(n)+phi(phi(n))+....+ 1.
A113808
Positive integers n such that S(n) divides n, where S(n) is the sum of the iterates of the Euler phi-function of n, that is, S(n) = phi(n)+phi(phi(n))+....+ 1.
Terms
- a(0) =1a(1) =2a(2) =3a(3) =6a(4) =9a(5) =15a(6) =18a(7) =27a(8) =30a(9) =39a(10) =54a(11) =78a(12) =81a(13) =111a(14) =162a(15) =183a(16) =222a(17) =243a(18) =255a(19) =327a(20) =363a(21) =366a(22) =471a(23) =486a(24) =510a(25) =654a(26) =726a(27) =729a(28) =942a(29) =1458
External references
- oeis: A113808