Numbers k such that k, phi(k) and cototient(k) are all perfect powers.

Terms

a(0) =8a(1) =16a(2) =32a(3) =64a(4) =125a(5) =128a(6) =256a(7) =512a(8) =1024a(9) =2048a(10) =3125a(11) =4096a(12) =4913a(13) =8192a(14) =16384a(15) =32768a(16) =50653a(17) =65536a(18) =78125a(19) =131072a(20) =262144a(21) =524288a(22) =1030301a(23) =1048576a(24) =1419857a(25) =1953125a(26) =2097152a(27) =4194304a(28) =7645373a(29) =8388608