sigma(n) + n is a fourth power.

Terms

a(0) =33a(1) =7153a(2) =16065a(3) =29976a(4) =36673a(5) =39169a(6) =117985a(7) =849385a(8) =2475045a(9) =2757073a(10) =5421336a(11) =7137025a(12) =9474784a(13) =10797120a(14) =11596833a(15) =13627248a(16) =15714240a(17) =25586785a(18) =26821458a(19) =28849249a(20) =37001785a(21) =40441441a(22) =43751896a(23) =69748561a(24) =70338768a(25) =95516836