Numbers n such that phi(n), psi(n) and sigma(n) are simultaneously perfect squares.

Terms

a(0) =1a(1) =170a(2) =679a(3) =5770a(4) =9154a(5) =9809a(6) =14322a(7) =22413a(8) =37114a(9) =51455a(10) =82615a(11) =100821a(12) =101153a(13) =115430a(14) =139954a(15) =171069a(16) =198462a(17) =222893a(18) =233358a(19) =270485a(20) =349894a(21) =389045a(22) =391090a(23) =514294a(24) =561782a(25) =595122a(26) =608685a(27) =664853a(28) =701338a(29) =815538