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

Terms

a(0) =10a(1) =160a(2) =301a(3) =752a(4) =912a(5) =1033a(6) =2560a(7) =2801a(8) =6277a(9) =11852a(10) =12032a(11) =12661a(12) =14592a(13) =27297a(14) =35809a(15) =38576a(16) =40960a(17) =73872a(18) =96688a(19) =123601a(20) =133904a(21) =151312a(22) =183589a(23) =189632a(24) =192512a(25) =233472a(26) =561168a(27) =578448a(28) =617216a(29) =629212