Numbers k such that phi(k) is a perfect 7th power.

Terms

a(0) =1a(1) =2a(2) =255a(3) =256a(4) =272a(5) =320a(6) =340a(7) =384a(8) =408a(9) =480a(10) =510a(11) =21845a(12) =32768a(13) =32896a(14) =34816a(15) =34952a(16) =40960a(17) =41120a(18) =43520a(19) =43690a(20) =49152a(21) =49344a(22) =52224a(23) =52428a(24) =61440a(25) =61680a(26) =65280a(27) =280999a(28) =281587a(29) =282637