Numbers n such that sigma(n) = 2n - 3*phi(phi(n)).

Terms

a(0) =7a(1) =13a(2) =19a(3) =37a(4) =73a(5) =97a(6) =109a(7) =163a(8) =193a(9) =369a(10) =433a(11) =487a(12) =577a(13) =769a(14) =1153a(15) =1297a(16) =1459a(17) =2593a(18) =2917a(19) =3457a(20) =3889a(21) =10369a(22) =12289a(23) =17497a(24) =18433a(25) =39367a(26) =52489a(27) =139969a(28) =147457a(29) =209953