Numbers k such that phi(k) is a perfect square.

Terms

a(0) =1a(1) =2a(2) =5a(3) =8a(4) =10a(5) =12a(6) =17a(7) =32a(8) =34a(9) =37a(10) =40a(11) =48a(12) =57a(13) =60a(14) =63a(15) =74a(16) =76a(17) =85a(18) =101a(19) =108a(20) =114a(21) =125a(22) =126a(23) =128a(24) =136a(25) =160a(26) =170a(27) =185a(28) =192a(29) =197