Numbers k such that k = 2*phi(k) + phi(phi(k)).

Terms

a(0) =10a(1) =14a(2) =20a(3) =28a(4) =40a(5) =56a(6) =80a(7) =112a(8) =160a(9) =224a(10) =320a(11) =448a(12) =640a(13) =896a(14) =1280a(15) =1792a(16) =2560a(17) =3584a(18) =5120a(19) =7168a(20) =10240a(21) =14336a(22) =20480a(23) =28672a(24) =40960a(25) =57344a(26) =81920a(27) =114688a(28) =163840a(29) =229376