Numbers n for which sigma(n)/n=k+2/3 with integer k.

Terms

a(0) =84a(1) =270a(2) =1488a(3) =1638a(4) =24384a(5) =35640a(6) =199584a(7) =2142720a(8) =12999168a(9) =100651008a(10) =208565280a(11) =240589440a(12) =470564640a(13) =3899750400a(14) =6039429120a(15) =25769607168a(16) =36639203328a(17) =53798734080a(18) =231758392320a(19) =314039721600a(20) =412316073984