Squarefree n such that sigma(phi(n)) = phi(sigma(n)).

Terms

a(0) =1a(1) =29262a(2) =114630a(3) =160986a(4) =179562a(5) =252978a(6) =502878a(7) =528954a(8) =780258a(9) =908070a(10) =1080906a(11) =1826454a(12) =2460786a(13) =2870142a(14) =3934686a(15) =5086722a(16) =5493030a(17) =6001206a(18) =6183078a(19) =6621270a(20) =6668634a(21) =8808234a(22) =9298110a(23) =9752190a(24) =10479282a(25) =11707518a(26) =12263334a(27) =12928254a(28) =13513278