7608944640domain: NAppears in sequencesSolutions x of 2*uphi(x)=x, where uphi is the unitary phi function (A047994).at n=7A030163Numbers such that 2*UnitaryPhi(2*UnitaryPhi(n)) = n.at n=28A120453Integers k such that uphi(k) divides k, where uphi is the unitary phi function (A047994).at n=9A319481