Numbers n such that phi(n') = phi(n)', where phi(n) is the Euler totient function of n and n' is the arithmetic derivative of n.

A260961

Numbers n such that phi(n') = phi(n)', where phi(n) is the Euler totient function of n and n' is the arithmetic derivative of n.

Terms

    a(0) =1a(1) =3a(2) =8a(3) =28a(4) =32a(5) =36a(6) =40a(7) =50a(8) =56a(9) =80a(10) =128a(11) =176a(12) =184a(13) =228a(14) =324a(15) =368a(16) =448a(17) =472a(18) =504a(19) =560a(20) =576a(21) =664a(22) =704a(23) =1328a(24) =1336a(25) =1512a(26) =1620a(27) =1686a(28) =1816a(29) =2048

External references