Unitary sigma-unitary phi super perfect numbers: USUP(USUP(n))= n/k for some integer k.

Terms

a(0) =1a(1) =2a(2) =3a(3) =4a(4) =5a(5) =6a(6) =8a(7) =9a(8) =10a(9) =12a(10) =16a(11) =17a(12) =18a(13) =20a(14) =24a(15) =34a(16) =36a(17) =40a(18) =48a(19) =68a(20) =72a(21) =80a(22) =136a(23) =144a(24) =256a(25) =257a(26) =272a(27) =514a(28) =768a(29) =1028