Numbers k such that sigma(k) >= 4*k.

Terms

a(0) =27720a(1) =30240a(2) =32760a(3) =50400a(4) =55440a(5) =60480a(6) =65520a(7) =75600a(8) =83160a(9) =85680a(10) =90720a(11) =95760a(12) =98280a(13) =100800a(14) =105840a(15) =110880a(16) =115920a(17) =120120a(18) =120960a(19) =128520a(20) =131040a(21) =138600a(22) =141120a(23) =143640a(24) =151200a(25) =163800a(26) =166320a(27) =171360a(28) =176400a(29) =180180