sigma(n) + phi(n) is a fourth power.

Terms

a(0) =110a(1) =125a(2) =609a(3) =2047a(4) =4895a(5) =9819a(6) =10149a(7) =10367a(8) =18974a(9) =31269a(10) =37032a(11) =40662a(12) =42032a(13) =44238a(14) =44835a(15) =48125a(16) =51459a(17) =51535a(18) =52487a(19) =77425a(20) =90090a(21) =116633a(22) =129846a(23) =137865a(24) =145299a(25) =146566a(26) =151438a(27) =159565a(28) =161614a(29) =162334