Totient(n) and cototient(n) are squares.

Terms

a(0) =1a(1) =2a(2) =5a(3) =8a(4) =17a(5) =32a(6) =37a(7) =101a(8) =125a(9) =128a(10) =197a(11) =257a(12) =401a(13) =468a(14) =512a(15) =577a(16) =677a(17) =1297a(18) =1417a(19) =1601a(20) =1872a(21) =2048a(22) =2340a(23) =2917a(24) =3125a(25) =3137a(26) =3145a(27) =4100a(28) =4212a(29) =4357