Numbers k such that phi(k)+sigma(k) is a perfect cube.

Terms

a(0) =99a(1) =814a(2) =1371a(3) =2047a(4) =2883a(5) =5816a(6) =6105a(7) =6851a(8) =10718a(9) =16744a(10) =19390a(11) =19651a(12) =20080a(13) =20115a(14) =20820a(15) =22015a(16) =22165a(17) =22550a(18) =23035a(19) =25976a(20) =30090a(21) =31999a(22) =32130a(23) =34479a(24) =36492a(25) =36865a(26) =37043a(27) =39942a(28) =40347a(29) =42591