Hyperperfect numbers: x such that x = 1 + k*(sigma(x)-x-1) for some k > 0.

Terms

a(0) =6a(1) =21a(2) =28a(3) =301a(4) =325a(5) =496a(6) =697a(7) =1333a(8) =1909a(9) =2041a(10) =2133a(11) =3901a(12) =8128a(13) =10693a(14) =16513a(15) =19521a(16) =24601a(17) =26977a(18) =51301a(19) =96361a(20) =130153a(21) =159841a(22) =163201a(23) =176661a(24) =214273a(25) =250321a(26) =275833a(27) =296341a(28) =306181a(29) =389593