Numbers k such that phi(k) divides k+1, where phi is Euler's totient function (A000010).

A203966

Numbers k such that phi(k) divides k+1, where phi is Euler's totient function (A000010).

Terms

    a(0) =1a(1) =2a(2) =3a(3) =15a(4) =255a(5) =65535a(6) =83623935a(7) =4294967295

External references