Numbers k such that 2^phi(k) == phi(k)^2 (mod k^2).

Terms

a(0) =1a(1) =3a(2) =4a(3) =5a(4) =6a(5) =8a(6) =10a(7) =12a(8) =384a(9) =640a(10) =768a(11) =896a(12) =960a(13) =24576a(14) =49152a(15) =950272a(16) =1425408a(17) =1572864a(18) =3145728a(19) =10485760a(20) =19398656a(21) =65011712a(22) =100663296a(23) =110057537a(24) =201326592a(25) =220115074a(26) =671088640a(27) =1879048192