Harmonic numbers (A001599) k with a record abundancy index sigma(k)/k.

A335318

Harmonic numbers (A001599) k with a record abundancy index sigma(k)/k.

Terms

    a(0) =1a(1) =6a(2) =140a(3) =270a(4) =672a(5) =8190a(6) =30240a(7) =332640a(8) =14303520a(9) =17428320a(10) =27027000a(11) =191711520a(12) =2144862720a(13) =3506025600a(14) =5943057120a(15) =14378364000a(16) =45578332800a(17) =288662774400a(18) =505159855200

External references