Numbers k such that A005187(k) < sigma(k) <= 2k, where A005187(k) = 2k - {binary weight of k}.

A326138

Numbers k such that A005187(k) < sigma(k) <= 2k, where A005187(k) = 2k - {binary weight of k}.

Terms

    a(0) =6a(1) =28a(2) =110a(3) =496a(4) =884a(5) =8128a(6) =18632a(7) =85936a(8) =116624a(9) =391612a(10) =15370304a(11) =17619844a(12) =33550336a(13) =73995392a(14) =815634435a(15) =3915380170a(16) =5556840416a(17) =6800695312a(18) =8589869056a(19) =42783299288a(20) =80999455688a(21) =137438691328a(22) =217898810368a(23) =546409576448

External references