Numbers k such that A017666(k) = denominator(sigma(k)/k) = 3.

Terms

a(0) =3a(1) =12a(2) =84a(3) =234a(4) =270a(5) =1080a(6) =1488a(7) =1638a(8) =6048a(9) =6552a(10) =24384a(11) =35640a(12) =199584a(13) =435708a(14) =2142720a(15) =4713984a(16) =12999168a(17) =18506880a(18) =36197280a(19) =100651008a(20) =208565280a(21) =240589440a(22) =275890944a(23) =299980800a(24) =470564640a(25) =3899750400a(26) =4138364160a(27) =6039429120a(28) =13286744064a(29) =17827568640