Numbers k such that sigma(k)/k, sigma_3(k)/k, sigma_5(k)/k and sigma_7(k)/k are all integers.

A076234

Numbers k such that sigma(k)/k, sigma_3(k)/k, sigma_5(k)/k and sigma_7(k)/k are all integers.

Terms

    a(0) =1a(1) =6a(2) =120a(3) =672a(4) =30240a(5) =32760a(6) =33550336a(7) =459818240a(8) =1379454720a(9) =8589869056a(10) =31998395520a(11) =51001180160a(12) =137438691328a(13) =153003540480

External references