Numbers whose divisors' harmonic and arithmetic means are both integers.

Terms

a(0) =1a(1) =6a(2) =140a(3) =270a(4) =672a(5) =1638a(6) =2970a(7) =6200a(8) =8190a(9) =18600a(10) =18620a(11) =27846a(12) =30240a(13) =32760a(14) =55860a(15) =105664a(16) =117800a(17) =167400a(18) =173600a(19) =237510a(20) =242060a(21) =332640a(22) =360360a(23) =539400a(24) =695520a(25) =726180a(26) =753480a(27) =1089270a(28) =1421280a(29) =1539720