Numbers k that divide 3*sigma(k).

Terms

a(0) =1a(1) =3a(2) =6a(3) =12a(4) =28a(5) =84a(6) =120a(7) =234a(8) =270a(9) =496a(10) =672a(11) =1080a(12) =1488a(13) =1638a(14) =6048a(15) =6552a(16) =8128a(17) =24384a(18) =30240a(19) =32760a(20) =35640a(21) =199584a(22) =435708a(23) =523776a(24) =2142720a(25) =2178540a(26) =4713984a(27) =12999168a(28) =18506880a(29) =23569920