n+sigma(n)+sigma(sigma(n)) is a cube.

Terms

a(0) =517a(1) =1403a(2) =2467a(3) =28265a(4) =28580a(5) =49888a(6) =52396a(7) =77429a(8) =81099a(9) =290936a(10) =319600a(11) =394731a(12) =462803a(13) =555543a(14) =601943a(15) =617716a(16) =633065a(17) =634808a(18) =720401a(19) =775669a(20) =884835a(21) =894024a(22) =1077432a(23) =1089360a(24) =1170136a(25) =1178152a(26) =1191789a(27) =1209357