Numbers k such that sigma(k) - phi(k) is a 4th power.

Terms

a(0) =1a(1) =15a(2) =560a(3) =570a(4) =1071a(5) =1102a(6) =1185a(7) =2035a(8) =2071a(9) =2128a(10) =2185a(11) =3007a(12) =3215a(13) =4087a(14) =4487a(15) =4584a(16) =5406a(17) =9204a(18) =10727a(19) =13912a(20) =16675a(21) =17951a(22) =17970a(23) =19127a(24) =20553a(25) =24288a(26) =24887a(27) =28247a(28) =28290a(29) =30216