Numbers k such that phi(k) + k is a fourth power.

Terms

a(0) =12a(1) =41a(2) =172a(3) =176a(4) =192a(5) =313a(6) =385a(7) =972a(8) =1008a(9) =1201a(10) =2732a(11) =2752a(12) =2816a(13) =3072a(14) =6668a(15) =7321a(16) =14281a(17) =15552a(18) =16128a(19) =25616a(20) =29425a(21) =41761a(22) =43696a(23) =43712a(24) =44032a(25) =45056a(26) =49152a(27) =78732a(28) =78768a(29) =79056